Generate pkg-config files

ports/allegro5/fix-pdb-install.patch

@@ -1,3 +1,24 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 72348fe..c6fbecb 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -1010,14 +1010,9 @@ else()
+     set(PKG_CONFIG_FILES allegro ${ADDON_PKG_CONFIG_FILES})
+ endif(WANT_MONOLITH)
+
+-# Install pkg-config files on Unix, and when cross-compiling on Unix.
++# Install pkg-config files
+
+-if(UNIX AND NOT WANT_FRAMEWORKS AND NOT IPHONE)
+-    set(INSTALL_PKG_CONFIG_FILES true)
+-endif()
+-if(CMAKE_CROSSCOMPILING AND CMAKE_HOST_UNIX)
+-    set(INSTALL_PKG_CONFIG_FILES true)
+-endif()
++set(INSTALL_PKG_CONFIG_FILES true)
+
+ if(INSTALL_PKG_CONFIG_FILES)
+     append_lib_type_suffix(lib_type)
 diff --git a/cmake/Common.cmake b/cmake/Common.cmake
 index 782196f..de29535 100644
 --- a/cmake/Common.cmake