Initial commit.
src: Add missing syscalls.
src: Move uwrap wrapper to own functions.

This should make it clearer and avoid hopefully endless loops.
cmake: Fix linking against libdl.
tests: Add a testsuite.
tests: Fix 'make test'.
tests: Add test_uwrap_setegid().
tests: Add test_uwrap_syscall().
src: Fix va_arg parsing.
tests: Add test_uwrap_syscall_setregid().
config: Remove unused defines.
src: Add all syscalls needed for Samba.
tests: Add test_uwrap_syscall().

This doesn't work cause syscall() doesn't work with a va_list.
src: Get the libc syscall() working.
src: Add a libc_vsyscall() function.
src: Add some debug output.
src: Remove unused header.
tests: Add as syscall stat test.
src: Fix setting the initial uid and gid.
tests: Fix the test after setting the correct initial uid.