gst-validate: Fix build on musl

gst-validate: Fix build on musl

Connect has different signature on musl.

Fixes
socket_interposer.c:103:1: error: conflicting types for 'connect'
| connect (int socket, const struct sockaddr_in *addrin, socklen_t
address_len)
| ^
|
recipe-sysroot/usr/include/sys/socket.h:327:5:
note: previous declaration is here
| int connect (int, const struct sockaddr *, socklen_t);
|     ^

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>