Move common/ui/keypad.c -> common/ui/keypad.cpp

SConstruct

@@ -638,7 +638,7 @@ class DXXArchive(DXXCommon):
 'ui/gadget.cpp',
 'ui/icon.cpp',
 'ui/inputbox.cpp',
-'ui/keypad.c',
+'ui/keypad.cpp',
 'ui/keypress.c',
 'ui/keytrap.c',
 'ui/listbox.c',

common/include/func.h

@@ -16,6 +16,10 @@ COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
 #ifndef _FUNC_H
 #define _FUNC_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct {
 	char *  name;
 	int     nparams;
@@ -31,4 +35,8 @@ void func_set_param( int n, int value );
 int func_get_param( int n );
 int func_get_index( char * name );
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif