Win32: Add library name suffix to pkg-config file

Closes #2386

This was adapted to 3.3-stable from
93a3ba808067134b5a964b1a1c44701450386fe4.

CMakeLists.txt

@@ -45,6 +45,7 @@ if (BUILD_SHARED_LIBS AND UNIX)
 else()
     set(GLFW_LIB_NAME glfw3)
 endif()
+set(GLFW_LIB_NAME_SUFFIX "")
 
 if (GLFW_VULKAN_STATIC)
     if (BUILD_SHARED_LIBS)
@@ -196,6 +197,10 @@ if (_GLFW_WIN32)
     if (GLFW_USE_HYBRID_HPG)
         set(_GLFW_USE_HYBRID_HPG 1)
     endif()
+
+    if (BUILD_SHARED_LIBS)
+        set (GLFW_LIB_NAME_SUFFIX "dll")
+    endif()
 endif()
 
 #--------------------------------------------------------------------

src/CMakeLists.txt

@@ -168,6 +168,7 @@ if (BUILD_SHARED_LIBS)
             # Add a suffix to the import library to avoid naming conflicts
             set_target_properties(glfw PROPERTIES IMPORT_SUFFIX "dll.lib")
         endif()
+        set (GLFW_LIB_NAME_SUFFIX "dll")
 
         target_compile_definitions(glfw INTERFACE GLFW_DLL)
     elseif (APPLE)

src/glfw3.pc.in

@@ -8,6 +8,6 @@ Description: A multi-platform library for OpenGL, window and input
 Version: @GLFW_VERSION@
 URL: https://www.glfw.org/
 Requires.private: @GLFW_PKG_DEPS@
-Libs: -L${libdir} -l@GLFW_LIB_NAME@
+Libs: -L${libdir} -l@GLFW_LIB_NAME@@GLFW_LIB_NAME_SUFFIX@
 Libs.private: @GLFW_PKG_LIBS@
 Cflags: -I${includedir}