Fix version in config header when used as subproject

Author: LordMZTE

cmake/VCSVersion.cmake

@@ -8,6 +8,7 @@ if(Git_FOUND)
             OUTPUT_VARIABLE _git_ref
             ERROR_QUIET
             OUTPUT_STRIP_TRAILING_WHITESPACE
+            WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
             )
 
     if(NOT _git_ref STREQUAL "")

src/api/version.h.in

@@ -1,11 +1,11 @@
 #pragma once
 
-#define PROJECTM_VERSION_MAJOR @CMAKE_PROJECT_VERSION_MAJOR@
-#define PROJECTM_VERSION_MINOR @CMAKE_PROJECT_VERSION_MINOR@
-#define PROJECTM_VERSION_PATCH @CMAKE_PROJECT_VERSION_PATCH@
+#define PROJECTM_VERSION_MAJOR @PROJECT_VERSION_MAJOR@
+#define PROJECTM_VERSION_MINOR @PROJECT_VERSION_MINOR@
+#define PROJECTM_VERSION_PATCH @PROJECT_VERSION_PATCH@
 
 /* Full version number as a string literal */
-#define PROJECTM_VERSION_STRING "@CMAKE_PROJECT_VERSION@"
+#define PROJECTM_VERSION_STRING "@PROJECT_VERSION@"
 
 /* VCS version number, e.g. Git commit hash */
 #define PROJECTM_VERSION_VCS "@PROJECTM_VCS_VERSION@"