revert r3875 since now map uses case sensetive regexes by default

src/http/modules/ngx_http_map_module.c

diff --git a/src/http/modules/ngx_http_map_module.c b/src/http/modules/ngx_http_map_module.c
index 8ca3fa3..6b724b3 100644
--- a/src/http/modules/ngx_http_map_module.c
+++ b/src/http/modules/ngx_http_map_module.c
@@ -526,6 +526,12 @@
 
         ngx_memzero(&rc, sizeof(ngx_regex_compile_t));
 
+        if (value[0].data[0] == '*') {
+            value[0].len--;
+            value[0].data++;
+            rc.options = NGX_REGEX_CASELESS;
+        }
+
         rc.pattern = value[0];
         rc.err.len = NGX_MAX_CONF_ERRSTR;
         rc.err.data = errstr;