base/asm-common.h: Add include guards.

diff --git a/base/asm-common.h b/base/asm-common.h
index d6a8b01..d1b23a6 100644 (file)
--- a/base/asm-common.h
+++ b/base/asm-common.h
@@ -24,6 +24,9 @@
 /// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 /// MA 02111-1307, USA.
 
+#ifndef CATACOMB_ASM_COMMON_H
+#define CATACOMB_ASM_COMMON_H
+
 ///--------------------------------------------------------------------------
 /// General definitions.
 
@@ -1181,3 +1184,5 @@ name:
 #endif
 
 ///----- That's all, folks --------------------------------------------------
+
+#endif