CI: add sanitizer builds.

.github/travis_build.sh

@@ -129,7 +129,6 @@ fi
 export UPX_UCLDIR="$ucl_SRCDIR"
 cd / && cd $upx_BUILDDIR || exit 1
 make="make -f $upx_SRCDIR/src/Makefile"
-EXTRA_CPPFLAGS="$EXTRA_CPPFLAGS -DUCL_NO_ASM"
 EXTRA_LDFLAGS="$EXTRA_LDFLAGS -L$ucl_BUILDDIR/src/.libs"
 if [[ $BUILD_LOCAL_ZLIB == 1 ]]; then
     EXTRA_CPPFLAGS="$EXTRA_CPPFLAGS -I$zlib_SRCDIR"
@@ -143,7 +142,6 @@ if [[ $BM_B =~ (^|\+)debug($|\+) ]]; then
     make="$make BUILD_TYPE_DEBUG=1"
 fi
 if [[ $BM_B =~ (^|\+)sanitize($|\+) ]]; then
-    case $TRAVIS_OS_NAME-$CC in linux-gcc*) EXTRA_LDFLAGS="$EXTRA_LDFLAGS -fuse-ld=gold" ;; esac
     make="$make BUILD_TYPE_SANITIZE=1"
 fi
 if [[ $BM_B =~ (^|\+)scan-build($|\+) ]]; then