add platform flag

Author: Maxxen

Makefile

@@ -52,7 +52,7 @@ EXTENSION_FLAGS=\
 #### Add more of the DuckDB in-tree extensions here that you need (also feel free to remove them when not needed)
 EXTRA_EXTENSIONS_FLAG=-DBUILD_EXTENSIONS="parquet;json"
 
-BUILD_FLAGS=-DEXTENSION_STATIC_BUILD=1 $(EXTENSION_FLAGS) ${EXTRA_EXTENSIONS_FLAG} $(OSX_BUILD_FLAG) $(TOOLCHAIN_FLAGS)
+BUILD_FLAGS=-DEXTENSION_STATIC_BUILD=1 $(EXTENSION_FLAGS) ${EXTRA_EXTENSIONS_FLAG} $(OSX_BUILD_FLAG) $(TOOLCHAIN_FLAGS) -DDUCKDB_EXPLICIT_PLATFORM='${DUCKDB_PLATFORM}'
 ifeq (${BUILD_SHELL}, 0)
 	BUILD_FLAGS += -DBUILD_SHELL=0
 else