Set PKG_CONFIG_PATH for arm builds

Signed-off-by: falkTX <falktx@falktx.com>

.github/workflows/build.yml

@@ -37,6 +37,7 @@ jobs:
           CC: aarch64-linux-gnu-gcc
           CXX: aarch64-linux-gnu-g++
           LDFLAGS: -static-libgcc -static-libstdc++
+          PKG_CONFIG_PATH: /usr/lib/aarch64-linux-gnu/pkgconfig
         run: |
           make features
           make WITH_LTO=true -j $(nproc)
@@ -74,6 +75,7 @@ jobs:
           CC: arm-linux-gnueabihf-gcc
           CXX: arm-linux-gnueabihf-g++
           LDFLAGS: -static-libgcc -static-libstdc++
+          PKG_CONFIG_PATH: /usr/lib/arm-linux-gnueabihf/pkgconfig
         run: |
           make features
           make WITH_LTO=true -j $(nproc)