[ld, testsuite] Only run rdynamic-1 when "-rdynamic" option is supported by compiler

[Jiong Wang]

This is the following error on arm bare-metal

   FAIL: Build rdynamic-1

"-rdynamic" is not supported by most bare-metal GCC, the only bare-metal I am
aware of is
  
   https://gcc.gnu.org/ml/gcc-patches/2011-02/msg00567.html

This patch implemented a -rdynamic availability check and gated "rdynamic-1"
build test.  GCC testsuite has added similar checks this week.

   https://gcc.gnu.org/ml/gcc-patches/2017-03/msg00258.html

No regression on X86-64/AArch64 native ld check.
OK for master?

Thanks.

ld/
2017-03-10  Jiong Wang  <jiong.wang@arm.com>

         * testsuite/lib/ld-lib.exp (check_rdynamic_available): New function.
         * testsuite/ld-elf/shared.exp (build_tests): Split tests which require
         GCC "-rdynamic" option support into "rdynamic_build_tests".
         (rdynamic_build_tests): New and only run it when
         check_rdynamic_available returns true.

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