tests: Fix warning in 05-sim-long_jumps.c
tests: Fix warning in 05-sim-long_jumps.c

Commit 3c2da115b5b35 "tests: improve 05-sim-long_jumps to work better
across arch/ABIs" introduced the following warning.  Let's fix it.

	05-sim-long_jumps.c: In function ‘main’:
	05-sim-long_jumps.c:68:25: warning: implicit declaration of function ‘free’ [-Wimplicit-function-declaration]
	   68 |                         free(syscall);

Acked-by: Paul Moore <a027184a55211cd23e3f3094f1fdc728df5e0500@paul-moore.com>
Signed-off-by: Tom Hromatka <96b9c1f2c09b98d7a09b4688fc637f1494d8e182@oracle.com>

seccomp/libseccomp,seccomp/libseccomp,seccomp/libseccomp