compilecode: Split out cleanmarks() to separate file.

cleanmarks() is used only by thompson/pike, so no need to pull it in for
other algorithms.

Makefile

@@ -19,6 +19,7 @@ OFILES=\
 	compilecode.o\
 	dumpcode.o\
 	charclass.o\
+	cleanmarks.o\
 	util.o\
 	y.tab.o\
 

cleanmarks.c

@@ -0,0 +1,24 @@
+// Copyright 2014 Paul Sokolovsky.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "re1.5.h"
+
+void
+cleanmarks(ByteProg *prog)
+{
+    char *pc = prog->insts;
+    char *end = pc + prog->bytelen;
+    while (pc < end) {
+        *pc &= 0x7f;
+        switch (*pc) {
+        case Jmp:
+        case Split:
+        case RSplit:
+        case Save:
+        case Char:
+                pc++;
+        }
+        pc++;
+    }
+}

compilecode.c

@@ -194,25 +194,6 @@ int re1_5_compilecode(ByteProg *prog, const char *re)
     return 0;
 }
 
-void
-cleanmarks(ByteProg *prog)
-{
-    char *pc = prog->insts;
-    char *end = pc + prog->bytelen;
-    while (pc < end) {
-        *pc &= 0x7f;
-        switch (*pc) {
-        case Jmp:
-        case Split:
-        case RSplit:
-        case Save:
-        case Char:
-                pc++;
-        }
-        pc++;
-    }
-}
-
 #if 0
 int main(int argc, char *argv[])
 {