Clean up header guards that don't match their file name

Header guard symbols should match their file name to make guard
collisions less likely.  Offenders found with
scripts/clean-header-guards.pl -vn.

Cleaned up with scripts/clean-header-guards.pl, followed by some
renaming of new guard symbols picked by the script to better ones.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
diff --git a/qga/service-win32.h b/qga/service-win32.h
index 3b9e870..89e99df 100644
--- a/qga/service-win32.h
+++ b/qga/service-win32.h
@@ -10,8 +10,9 @@
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  */
-#ifndef QGA_SERVICE_H
-#define QGA_SERVICE_H
+
+#ifndef QGA_SERVICE_WIN32_H
+#define QGA_SERVICE_WIN32_H
 
 #include <windows.h>