Disable symlinks: added explicit cast of AT_FDCWD (ticket #111). Solaris has AT_FDCWD defined to unsigned value, and comparison of a file descriptor with it causes warnings in modern versions of gcc. Explicitly cast AT_FDCWD to ngx_fd_t to resolve these warnings.

--- a/src/os/unix/ngx_files.h
+++ b/src/os/unix/ngx_files.h
@@ -340,6 +340,8 @@ size_t ngx_fs_bsize(u_char *name);
 
 #define ngx_file_at_info_n       "fstatat()"
 
+#define NGX_AT_FDCWD             (ngx_fd_t) AT_FDCWD
+
 #endif