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[cc1] Add missed extern keyword in globals declaration

--- a/cc1/cc1.h

+++ b/cc1/cc1.h

@@ -477,8 +477,8 @@

 extern unsigned curctx;

 extern Symbol *curfun, *zero, *one;

 extern char *infile, *outfile;

-unsigned lineno;

-char filenam[FILENAME_MAX];

+extern unsigned lineno;

+extern char filenam[FILENAME_MAX];

 extern Type *voidtype, *pvoidtype, *booltype,

             *uchartype,   *chartype, *schartype,