Fix build on musl libc with clang 16

Signed-off-by: Brahmajit Das <brahmajit.xyz@gmail.com>

Author: Brahmajit Das

src/gp_util.c

@@ -63,7 +63,7 @@ char *gp_strerror(int errnum)
     static __thread char buf[MAX_GP_STRERROR];
     int saved_errno = errno;
 
-#if ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE)
+#if ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE) || !defined(__GLIBC__)
     /* XSI version */
     int ret;
 

tests/userproxytest.c

@@ -5,6 +5,7 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <sys/wait.h>