build: autoconf: set ac_cv_func_setresuid=true

MUSL and eglibc provide these symbols.

Bind needs setresuid() to build properly in recent versions.

Signed-off-by: Philip Prindeville <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/15952
Signed-off-by: Hauke Mehrtens <[email protected]>

include/site/linux

@@ -37,7 +37,7 @@ ac_cv_func_rindex=yes
 ac_cv_func_setlocale=yes
 ac_cv_func_setgrent_void=yes
 ac_cv_func_setpgrp_void=yes
-ac_cv_func_setresuid=no
+ac_cv_func_setresuid=yes
 ac_cv_func_setvbuf_reversed=no
 ac_cv_func_stat_empty_string_bug=no
 ac_cv_func_stat_ignores_trailing_slash=no