Fixed Linux warnings.

common/lc_glext.h

@@ -1,4 +1,5 @@
-#pragma once
+#ifndef __glext_h_
+#define __glext_h_ 1
 
 #ifdef __cplusplus
 extern "C" {
@@ -11843,3 +11844,4 @@ GLAPI void APIENTRY glReplacementCodeuiTexCoord2fColor4fNormal3fVertex3fvSUN (co
 }
 #endif
 
+#endif

common/lc_global.h

@@ -1,4 +1,5 @@
-#pragma once
+#ifndef LC_GLOBAL_H
+#define LC_GLOBAL_H
 
 #include <QtGlobal>
 #include <QWidget>
@@ -74,3 +75,4 @@ class lcFile;
 class lcMemFile;
 class lcDiskFile;
 
+#endif // LC_GLOBAL_H