[openblas] Fix generating pkg-config file (microsoft#12956)

ports/openblas/CONTROL

@@ -1,6 +1,6 @@
 Source: openblas
 Version: 0.3.9
-Port-Version: 2
+Port-Version: 3
 Homepage: https://github.com/xianyi/OpenBLAS
 Build-Depends: pthread (linux&osx)
 Description: OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version.

ports/openblas/fix-pkg-config.patch

@@ -0,0 +1,19 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index c324e224..4b82d767 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -389,11 +389,9 @@ if(NOT NO_LAPACKE)
+ 	install (FILES ${CMAKE_BINARY_DIR}/lapacke_mangling.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/openblas${SUFFIX64})
+ endif()
+
+-include(FindPkgConfig QUIET)
+-if(PKG_CONFIG_FOUND)
+-	configure_file(${PROJECT_SOURCE_DIR}/cmake/openblas.pc.in ${PROJECT_BINARY_DIR}/openblas${SUFFIX64}.pc @ONLY)
+-	install (FILES ${PROJECT_BINARY_DIR}/openblas${SUFFIX64}.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig/)
+-endif()
++# Install pkg-config files
++configure_file(${PROJECT_SOURCE_DIR}/cmake/openblas.pc.in ${PROJECT_BINARY_DIR}/openblas${SUFFIX64}.pc @ONLY)
++install (FILES ${PROJECT_BINARY_DIR}/openblas${SUFFIX64}.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig/)
+
+
+ # GNUInstallDirs "DATADIR" wrong here; CMake search path wants "share".

ports/openblas/portfile.cmake

@@ -9,6 +9,7 @@ vcpkg_from_github(
         fix-space-path.patch
         fix-redefinition-function.patch
         github_2481.patch
+        fix-pkg-config.patch
 )
 
 find_program(GIT NAMES git git.cmd)