Try to work around ubuntu gcc-5 ubsan build failure

[extended tests]

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6362)

.travis.yml

@@ -61,7 +61,7 @@ matrix:
                   sources:
                       - ubuntu-toolchain-r-test
           compiler: gcc-5
-          env: CONFIG_OPTS="no-asm enable-ubsan enable-rc5 enable-md2 -DPEDANTIC"
+          env: UBUNTU_GCC_HACK="yes" CONFIG_OPTS="no-asm enable-ubsan enable-rc5 enable-md2 -DPEDANTIC"
         - os: linux
           addons:
               apt:
@@ -112,6 +112,10 @@ before_script:
           srcdir=.;
           top=.;
       fi
+    - if [ -n "$UBUNTU_GCC_HACK" ]; then
+          $CC -dumpspecs | sed "s/--push-state//g; s/--pop-state/--as-needed/g" > gcc-specs.txt;
+          CC="$CC -specs=gcc-specs.txt";
+      fi
     - if [ "$CC" == i686-w64-mingw32-gcc ]; then
           export CROSS_COMPILE=${CC%%gcc}; unset CC;
           $srcdir/Configure mingw $CONFIG_OPTS -Wno-pedantic-ms-format;