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Make `peek()` tail recursive instead of using `goto`

Compilation is identical with `gcc` or `clang`, -O3` or `-O2`

--- a/src/asm/lexer.c

+++ b/src/asm/lexer.c

@@ -900,11 +900,8 @@

 static int peek(void)

 {

-	int c;

+	int c = peekInternal(0);

-restart:

-	c = peekInternal(0);

-

 	if (lexerState->macroArgScanDistance > 0)

 		return c;

@@ -924,7 +921,7 @@

 			 * expanded, so skip it and keep peeking.

 			 */

 			if (!str || !str[0])

-				goto restart;

+				return peek();

 			beginExpansion(str, c == '#', NULL);

@@ -945,7 +942,7 @@

 		if (str && str[0])

 			beginExpansion(str, false, str);

-		goto restart;

+		return peek();

 	}

 	return c;