preparatory patch for -Wwrite-strings #2
diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index 54d291a..601ff3f 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -184,7 +184,7 @@
 	/* Why static? */
 	static int failed;
 	pid_t pid;
-	char *prog;
+	const char *prog;
 
 	// Be nice to nommu machines.
 	failed = 0;
@@ -240,7 +240,7 @@
 // Fifth char is always '\0'
 void smart_ulltoa5(unsigned long long ul, char buf[5])
 {
-	char *fmt;
+	const char *fmt;
 	char c;
 	unsigned v,idx = 0;
 	ul *= 10;