Applied patch from Matt Kraai which does the following:

- adds case-insensitive matching in sed s/// epxressions
 - consolodates common regcomp code in grep & sed into bb_regcomp and put in
   utility.c
 - cleans up a bunch of cruft

utility.c

@@ -1721,6 +1721,22 @@ char *get_last_path_component(char *path)
 }
 #endif
 
+#if defined BB_GREP || defined BB_SED
+int bb_regcomp(regex_t *preg, const char *regex, int cflags)
+{
+	int ret;
+	if ((ret = regcomp(preg, regex, cflags)) != 0) {
+		int errmsgsz = regerror(ret, preg, NULL, 0);
+		char *errmsg = xmalloc(errmsgsz);
+		regerror(ret, preg, errmsg, errmsgsz);
+		errorMsg("bb_regcomp: %s\n", errmsg);
+		free(errmsg);
+		regfree(preg);
+	}
+	return ret;
+}
+#endif
+
 /* END CODE */
 /*
 Local Variables: