v8.7.0-rc1 + hotfix for kleisauke/net-vips#12

Final pre-release for the upcoming libvips 8.7.0. This release includes a hotfix for kleisauke/net-vips#12 by adding FILE_SHARE_DELETE to the file sharing mode for the jpegload, tiffload and pdfload loaders.

v8.6.5

Update for 8.6.5

- Update ImageMagick to 6.9.10-8.
- Update libjpeg-turbo to 2.0.0.
- Update librsvg to 2.43.2.
- Update Pango to 1.42.2.
- Update Poppler to 0.67.0.

MXE updates:
- Update libpng to 1.6.35.
- Update HarfBuzz to 1.8.4.

v8.6.4

Update for 8.6.4

- Update FFTW to 3.3.8.
- Update ImageMagick to 6.9.10-1.
- Update librsvg to 2.43.0.
- Update Cairo to 1.15.12.

v8.6.3

Initial commit