Commits on Aug 27, 2024

1. Set PKG_CONFIG_PATH to ensure gpgme builds with local libassuan …

   We had some build failures on macOS with this error:
   
   ```
   configure: Use gpgrt-config as libassuan-config
   checking for LIBASSUAN - version >= 2.4.2... yes (3.0.1)
   checking LIBASSUAN API version... does not match.  want=2 got=3.
   ```
   
   This occurs when:
   
   1. libassuan v3.0 is installed.
   2. `PKG_CONFIG_PATH` includes the Homebrew path of `/opt/homebrew/lib/pkgconfig`.
   
   https://github.com/gpg/gpgme/blob/5bf3e6d0754a179b316f90a885371af99bc03ea1/m4/libassuan.m4#L32
   attempts to run `gpgrt-config libassuan --exists`. This will return
   the Homebrew version of libassuan if `PKG_CONFIG_PATH` includes it.
   
   To avoid this build failure, preface `PKG_CONFIG_PATH` with the local
   versions of libassuan and libgpg-error.

   

   stanhu committed Aug 27, 2024
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