Test for existence of bmif.pc on Windows

Author: mdpiper

.github/workflows/test.yml

@@ -110,4 +110,4 @@ jobs:
           if ( -not ( Test-Path -Path ${{ env.LIBRARY_PREFIX }}\lib\libbmif_win.dll.a ) ){ exit 1 }
           if ( -not ( Test-Path -Path ${{ env.LIBRARY_PREFIX }}\bin\libbmif_win.dll ) ){ exit 1 }
           if ( -not ( Test-Path -Path ${{ env.LIBRARY_PREFIX }}\include\bmif_${{ env.BMI_VERSION }}.mod ) ){ exit 1 }
-          if ( -not ( pkg-config --exists --print-errors bmif ) ){ exit 1 }
+          if ( -not ( Test-Path -Path ${{ env.LIBRARY_PREFIX }}\lib\pkgconfig\bmif.pc ) ){ exit 1 }