Enable building ref-cache in a separate build directory

Add ref_cache/ to the list of subdirectories to be created in the
build directory when configure is run.

Include <config.h> thus, as recommended by the autoconf documentation.
The header will be found via -I. as it is from cram/*.c and test/*.c.

Author: jmarshall

configure.ac

@@ -796,6 +796,7 @@ if test "$srcdir" != .; then
     [AS_MKDIR_P([cram])
      AS_MKDIR_P([htscodecs/htscodecs])
      AS_MKDIR_P([htscodecs/tests])
+     AS_MKDIR_P([ref_cache])
      AS_MKDIR_P([test/fuzz])
      AS_MKDIR_P([test/longrefs])
      AS_MKDIR_P([test/tabix])])

ref_cache/http_parser.c

@@ -22,7 +22,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.  */
 
-#include "../config.h"
+#include <config.h>
 
 #include <stdlib.h>
 #include <stdio.h>

ref_cache/listener.c

@@ -22,7 +22,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.  */
 
-#include "../config.h"
+#include <config.h>
 
 #include <stdlib.h>
 #include <stdio.h>

ref_cache/log_files.c

@@ -22,7 +22,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.  */
 
-#include "../config.h"
+#include <config.h>
 
 #include <stdlib.h>
 #include <stdio.h>

ref_cache/main.c

@@ -22,7 +22,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.  */
 
-#include "../config.h"
+#include <config.h>
 
 #include <stdlib.h>
 #include <stdio.h>

ref_cache/misc.c

@@ -22,7 +22,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.  */
 
-#include "../config.h"
+#include <config.h>
 
 #include "misc.h"
 

ref_cache/ping.c

@@ -22,7 +22,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.  */
 
-#include "../config.h"
+#include <config.h>
 
 #include <stdlib.h>
 #include <stdio.h>

ref_cache/poll_wrap_epoll.c

@@ -22,7 +22,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.  */
 
-#include "../config.h"
+#include <config.h>
 
 #if defined(HAVE_EPOLL) && HAVE_EPOLL
 

ref_cache/poll_wrap_poll.c

@@ -22,7 +22,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.  */
 
-#include "../config.h"
+#include <config.h>
 
 #if !(defined(HAVE_EPOLL) && HAVE_EPOLL)
 

ref_cache/ref_files.c

@@ -22,7 +22,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.  */
 
-#include "../config.h"
+#include <config.h>
 
 #include <stdlib.h>
 #include <errno.h>

ref_cache/request_handler.c

@@ -22,7 +22,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.  */
 
-#include "../config.h"
+#include <config.h>
 
 #include <fcntl.h>
 #include <stdlib.h>

ref_cache/server.c

@@ -22,7 +22,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.  */
 
-#include "../config.h"
+#include <config.h>
 
 #include <stdlib.h>
 #include <stdio.h>

ref_cache/transaction.c

@@ -22,7 +22,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.  */
 
-#include "../config.h"
+#include <config.h>
 
 /* Work out which sendfile() variety is available, if anything. */
 #if !defined(HAVE_LINUX_SENDFILE) && !defined(HAVE_FREEBSD_SENDFILE) && !defined(HAVE_MACOSX_SENDFILE)

ref_cache/upstream.c

@@ -22,7 +22,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 DEALINGS IN THE SOFTWARE.  */
 
-#include "../config.h"
+#include <config.h>
 
 #if defined(__APPLE__) && defined(__MACH__)
 // macOS headers hide CMSG_LEN() and CMSG_SPACE() definitions if these