modp_b64: Generate pkgconfig Generate a pkgconfig file for this project. BUG=b:176847216 TEST=emerge-zork modp_b64 Change-Id: Ie1058750a56da435aba949ecd31ed15e47d20f56 Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/external/modp_b64/+/2648693 Reviewed-by: Mike Frysinger <[email protected]> Tested-by: Abhishek Pandit-Subedi <[email protected]> Commit-Queue: Abhishek Pandit-Subedi <[email protected]>