Allow UTF characters in #pragmas

Reference: /n/sources/patch/applied/pragma-utf
Date: Sat Aug  6 07:13:40 CES 2011
Signed-off-by: lucio@proxima.alt.za

--- /sys/src/cmd/cc/macbody	Sat Aug  6 07:13:09 2011
+++ /sys/src/cmd/cc/macbody	Sat Aug  6 07:13:01 2011
@@ -25,7 +25,7 @@
 	char *cp;
 
 	c = getnsc();
-	if(!isalpha(c) && c != '_') {
+	if(!isalpha(c) && c != '_' && c < 0x80) {
 		unget(c);
 		return S;
 	}
@@ -33,7 +33,7 @@
 		if(cp <= symb+NSYMB-4)
 			*cp++ = c;
 		c = getc();
-		if(isalnum(c) || c == '_')
+		if(isalnum(c) || c == '_' || c >= 0x80)
 			continue;
 		unget(c);
 		break;