Revert "gst-ffmpeg: fix build for xtensa"

This reverts commit 7e558aa0d87d86be1bbc91b284acd0d11378ee4e.
Now that -mtext-section-literals is specified in the xtensa ABI this fix
is no longer needed.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gstreamer/gst-ffmpeg/gst-ffmpeg.mk

@@ -14,14 +14,6 @@ GST_FFMPEG_CONF_EXTRA_OPT = \
 		--cross-prefix=$(TARGET_CROSS) \
 		--target-os=linux
 
-GST_FFMPEG_CFLAGS = $(TARGET_CFLAGS)
-
-ifeq ($(BR2_xtensa),y)
-GST_FFMPEG_CFLAGS += -mtext-section-literals
-endif
-
-GST_FFMPEG_CONF_ENV = CFLAGS="$(GST_FFMPEG_CFLAGS)"
-
 ifeq ($(BR2_PACKAGE_ZLIB),y)
 GST_FFMPEG_CONF_EXTRA_OPT += --enable-zlib
 GST_FFMPEG_DEPENDENCIES += zlib