libgles-omap3: Skip ldflags check for debug binaries also

The libraries libusc.so, libPVRScopeServices.so, libews.so generate
"No GNU_HASH in the elf binary" error during rootfs packaging due to
prebuilt-binary packaging. This patch skips the check.

Signed-off-by: Prabindh Sundareson <prabu@ti.com>