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Fix iden()

A valid identifier has _ digits and letters.

--- a/cc1/lex.c

+++ b/cc1/lex.c

@@ -367,10 +367,10 @@

 static uint8_t

 iden(void)

 {

-	char c, *p;

+	char *p;

 	Symbol *sym;

-	for (p = input->p; isalpha(*p); ++p)

+	for (p = input->p; isalnum(*p) || *p == '_'; ++p)

 		/* nothing */;

 	input->p = p;

 	tok2str();