fix caseless locations, the bug had been introduced in r3326

src/http/ngx_http_core_module.c

diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index e05487e..edd294f 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -2588,6 +2588,8 @@
 
 #if (NGX_HAVE_CASELESS_FILESYSTEM)
     rc.options = NGX_REGEX_CASELESS;
+#else
+    rc.options = caseless;
 #endif
 
     clcf->regex = ngx_http_regex_compile(cf, &rc);