Merge branch 'tc/meson-use-our-version-def-h'

The meson build procedure looked for the 'version-def.h' file in a
wrong directory, which has been corrected.

* tc/meson-use-our-version-def-h:
  meson: ensure correct version-def.h is used

meson.build

@@ -1513,7 +1513,9 @@ libgit_version_library = static_library('git-version',
     'version.c',
     version_def_h,
   ],
-  c_args: libgit_c_args,
+  c_args: libgit_c_args + [
+    '-DGIT_VERSION_H="' + version_def_h.full_path() + '"',
+  ],
   dependencies: libgit_dependencies,
   include_directories: libgit_include_directories,
 )

version.c

@@ -1,8 +1,13 @@
 #include "git-compat-util.h"
 #include "version.h"
-#include "version-def.h"
 #include "strbuf.h"
 
+#ifndef GIT_VERSION_H
+# include "version-def.h"
+#else
+# include GIT_VERSION_H
+#endif
+
 const char git_version_string[] = GIT_VERSION;
 const char git_built_from_commit_string[] = GIT_BUILT_FROM_COMMIT;