[PATCH] Add TEST_CC and TEST_CXX support

[H.J. Lu]

Support testing glibc build with a different C compiler or a different
C++ compiler with

$ ../glibc-VERSION/configure TEST_CC="gcc-6.4.1" TEST_CXX="gi++-6.4.1"

1. Also check compiler options with TEST_CC and TEST_CXX.
2. Add check and xcheck targets to Makefile.in and override build compiler
options with ones from TEST_CC and TEST_CXX.

-- 
H.J.
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