win32: add the patch level to the .dll fileversion

Win32 DLLs have four fields for the version number (major, minor,
teeny, patch).  If a consumer wants to build a custom DLL, it may
be useful to set the patchlevel version number in the DLL.

This value only affects the DLL version number, it does not affect
the resultant "version number", which remains major.minor.teeny.

include/git2/version.h

@@ -11,6 +11,7 @@
 #define LIBGIT2_VER_MAJOR 0
 #define LIBGIT2_VER_MINOR 22
 #define LIBGIT2_VER_REVISION 0
+#define LIBGIT2_VER_PATCH 0
 
 #define LIBGIT2_SOVERSION 22
 

src/win32/git2.rc

@@ -6,8 +6,8 @@
 #endif
 
 VS_VERSION_INFO		VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
-  FILEVERSION		LIBGIT2_VER_MAJOR,LIBGIT2_VER_MINOR,LIBGIT2_VER_REVISION,0
-  PRODUCTVERSION	LIBGIT2_VER_MAJOR,LIBGIT2_VER_MINOR,LIBGIT2_VER_REVISION,0
+  FILEVERSION		LIBGIT2_VER_MAJOR,LIBGIT2_VER_MINOR,LIBGIT2_VER_REVISION,LIBGIT2_VER_PATCH
+  PRODUCTVERSION	LIBGIT2_VER_MAJOR,LIBGIT2_VER_MINOR,LIBGIT2_VER_REVISION,LIBGIT2_VER_PATCH
   FILEFLAGSMASK		VS_FFI_FILEFLAGSMASK
 #ifdef _DEBUG
   FILEFLAGS		VS_FF_DEBUG