[PATCH] tst-makecontext does not handle ENOSYS

[Steven Munroe]

For platforms that do not support *context functions, older kernels, or
when --enable-kernel= is not specified, some platforms generate ENOSYS
stubs for the *context functions. For example powerpc64 before 2.4.21. 

In this case the new stdlib/tst-makecontext.c test will fail when it
should just report the missing function and allow the make check to
continue.

The following patch adds the ENOSYS check and integrates tst-makecontext
with test-skeleton.c


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