Disable linker PIE support with copy reloc.

This feature gets enabled with binutils 2.27 upgrade, but
breaks unittests in chromium os:
  - https://bugs.chromium.org/p/chromium/issues/detail?id=738188

This is because of the upstream gcc bug for which the
patches were not backported to 4.9.x branches:
  - https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65248

BUG: None
TEST: Chromium OS unittests pass again.

Change-Id: I9827cbe56378727f979991993d06de0b4c6b5478
diff --git a/gcc-4.9/gcc/configure b/gcc-4.9/gcc/configure
index 436278b..a16ecab 100755
--- a/gcc-4.9/gcc/configure
+++ b/gcc-4.9/gcc/configure
@@ -27052,7 +27052,8 @@
     esac
   fi
 fi
-
+# Disable gcc linker PIE support with copy reloc
+gcc_cv_ld_pie_copyreloc=no
 cat >>confdefs.h <<_ACEOF
 #define HAVE_LD_PIE_COPYRELOC `if test x"$gcc_cv_ld_pie_copyreloc" = xyes; then echo 1; else echo 0; fi`
 _ACEOF