utils: sctp: Fix build for prefixed architectures

Commit 6f22494d19b605ded308dc0fa713e91cb873f44a
"Move sctp to utils and bump it to 1.0.15"

introduced a build failure for the prefixed architectures.
We need to take into consideration the __USER_LABEL_PREFIX__
for architectures that define it when creating symbol aliases.

The following upstream patch (0600c8968cc2dea04cbf13ec739216e2939d08fe)
fixes the build for the Meta(metag) architecture

[...]
utils/sctp/func_tests/test_connectx.c:151: undefined reference to `_sctp_connectx'
utils/sctp/func_tests/test_connectx.c:163: undefined reference to `_sctp_connectx'
[...]

Build tested on x86_64 and metag.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
1 file changed