gcc: Change parser declaration to have (possibly) C++ linkage.

* gcc-plugin/src/starpu.c (yyparse, yydebug): Move outside of `extern "C"'.

gcc-plugin/src/starpu.c

@@ -88,6 +88,12 @@
 
 #endif	/* !__cplusplus */
 
+
+/* C expression parser, possibly with C++ linkage.  */
+
+extern int yyparse (location_t, const char *, tree *);
+extern int yydebug;
+
 
 #ifdef __cplusplus
 extern "C" {
@@ -633,9 +639,6 @@ handle_pragma_wait (struct cpp_reader *reader)
 
 /* The minimal C expression parser.  */
 
-extern int yyparse (location_t, const char *, tree *);
-extern int yydebug;
-
 /* Parse expressions from the CPP reader for PRAGMA, which is located at LOC.
    Return a TREE_LIST of C expressions.  */