Add optional CMake parameter TINY_VERSION.

Parameter setting has the effect on 4th part of the version string in executable's version info on Windows.
It could be set e.g to bzr revno to uniquely identify  different builds for the same major.minor.patch combo.

win/cmake/mysql_version.cmake

@@ -116,6 +116,10 @@ ENDIF()
 # Refer to http://msdn.microsoft.com/en-us/library/aa381058(VS.85).aspx
 # for more info.
 IF(MSVC)
+    # Tiny version is used to identify the build, it can be set with cmake -DTINY_VERSION=<number>
+    # to bzr revno for example (in the CI builds)
+    SET(TINY_VERSION "0" CACHE INTERNAL "")
+  
     GET_FILENAME_COMPONENT(MYSQL_CMAKE_SCRIPT_DIR ${CMAKE_CURRENT_LIST_FILE} PATH)
 	
     SET(FILETYPE VFT_APP)

win/cmake/versioninfo.rc.in

 #include <windows.h>
 VS_VERSION_INFO VERSIONINFO
-FILEVERSION     @MAJOR_VERSION@,@MINOR_VERSION@,@PATCH@,0
-PRODUCTVERSION  @MAJOR_VERSION@,@MINOR_VERSION@,@PATCH@,0
+FILEVERSION     @MAJOR_VERSION@,@MINOR_VERSION@,@PATCH@,@TINY_VERSION@
+PRODUCTVERSION  @MAJOR_VERSION@,@MINOR_VERSION@,@PATCH@,@TINY_VERSION@
 FILEFLAGSMASK   VS_FFI_FILEFLAGSMASK
 FILEFLAGS       0
 FILEOS          VOS__WINDOWS32
@@ -12,8 +12,8 @@ BEGIN
     BEGIN
         BLOCK "040904E4"
         BEGIN
-            VALUE "FileVersion",      "@MAJOR_VERSION@.@MINOR_VERSION@.@PATCH@.0\0"
-            VALUE "ProductVersion",   "@MAJOR_VERSION@.@MINOR_VERSION@.@PATCH@.0\0"
+            VALUE "FileVersion",      "@MAJOR_VERSION@.@MINOR_VERSION@.@PATCH@.@TINY_VERSION@\0"
+            VALUE "ProductVersion",   "@MAJOR_VERSION@.@MINOR_VERSION@.@PATCH@.@TINY_VERSION@\0"
         END
     END
     BLOCK "VarFileInfo"