[PATCH] PR gold/20310: Pass down LDFLAGS from top level for "make check"

[Cary Coutant]

> These 2 tests are sensitive to compiler version.  They pass with GCC
> prior to GCC 6 with and without -static-libstdc++ -static-libgcc.  With
> GCC 6, which is in Fedora 24, they fail on i686 (2 failures) and x86-64
> (1 failure).

I'm unable to reproduce the problem with plugin_layout_alignment.sh,
using GCC 6 with -m32. Can you attach a copy of
testsuite/plugin_layout_with_alignment.sh.log (or
testsuite/test-suite.log)?

-cary