Add mg_strcasecmp()

CL: Add mg_strcasecmp()

PUBLISHED_FROM=cd2a26fa12473bfa0f5e7a0a1d34fb86562ee082

mongoose.h

@@ -2351,6 +2351,11 @@ int mg_strcmp(const struct mg_str str1, const struct mg_str str2);
  */
 int mg_strncmp(const struct mg_str str1, const struct mg_str str2, size_t n);
 
+/*
+ * Compare two `mg_str`s ignoreing case; return value is the same as `strcmp`.
+ */
+int mg_strcasecmp(const struct mg_str str1, const struct mg_str str2);
+
 /*
  * Free the string (assuming it was heap allocated).
  */
@@ -6239,6 +6244,7 @@ int mg_dns_encode_record(struct mbuf *io, struct mg_dns_resource_record *rr,
  * Encodes a DNS name.
  */
 int mg_dns_encode_name(struct mbuf *io, const char *name, size_t len);
+int mg_dns_encode_name_s(struct mbuf *io, struct mg_str name);
 
 /* Low-level: parses a DNS response. */
 int mg_parse_dns(const char *buf, int len, struct mg_dns_message *msg);