Commonize pattern matching functions

PUBLISHED_FROM=e69e298a51dbe0f9c47184169ecad06eef0676fc

docs/c-api/util.h/intro.md

@@ -14,10 +14,8 @@ items:
   - { name: mg_hexdump_connection.md }
   - { name: mg_hexdumpf.md }
   - { name: mg_is_big_endian.md }
-  - { name: mg_match_prefix.md }
   - { name: mg_mbuf_append_base64.md }
   - { name: mg_mbuf_append_base64_putc.md }
-  - { name: mg_next_comma_list_entry.md }
   - { name: mg_open.md }
   - { name: mg_skip.md }
   - { name: mg_sock_addr_to_str.md }

docs/c-api/util.h/mg_match_prefix.md

@@ -1,14 +0,0 @@
----
-title: "mg_match_prefix()"
-decl_name: "mg_match_prefix"
-symbol_kind: "func"
-signature: |
-  int mg_match_prefix(const char *pattern, int pattern_len, const char *str);
----
-
-Matches 0-terminated string (mg_match_prefix) or string with given length
-mg_match_prefix_n against a glob pattern.
-
-Match is case-insensitive. Returns number of bytes matched, or -1 if no
-match. 
-

docs/c-api/util.h/mg_next_comma_list_entry.md

@@ -1,21 +0,0 @@
----
-title: "mg_next_comma_list_entry()"
-decl_name: "mg_next_comma_list_entry"
-symbol_kind: "func"
-signature: |
-  const char *mg_next_comma_list_entry(const char *list, struct mg_str *val,
-                                       struct mg_str *eq_val);
----
-
-A helper function for traversing a comma separated list of values.
-It returns a list pointer shifted to the next value or NULL if the end
-of the list found.
-The value is stored in a val vector. If the value has a form "x=y", then
-eq_val vector is initialised to point to the "y" part, and val vector length
-is adjusted to point only to "x".
-If the list is just a comma separated list of entries, like "aa,bb,cc" then
-`eq_val` will contain zero-length string.
-
-The purpose of this function is to parse comma separated string without
-any copying/memory allocation. 
-