Revert "package/ffmpeg: Fix i586 compilation with gcc5"

Revert "package/ffmpeg: Fix i586 compilation with gcc5"

This reverts commit bfb8df2ad9b164b421d25294c6882c8b61dc59a5.

With current toolchains it was not possible to trigger the bug anymore.

Tested with these settings:

BR2_i386=y
BR2_x86_i586=y
BR2_GCC_VERSION_4_8_X=y

BR2_i386=y
BR2_x86_i586=y
BR2_GCC_VERSION_5_X=y

BR2_i386=y
BR2_x86_i586=y
BR2_GCC_VERSION_6_X=y

Other x86 variants also work:

BR2_i386=y
BR2_x86_i486=y
BR2_GCC_VERSION_5_X=y

BR2_i386=y
BR2_x86_i686=y
BR2_GCC_VERSION_5_X=y

BR2_i386=y
BR2_x86_pentium_mmx=y
BR2_GCC_VERSION_5_X=y

BR2_i386=y
BR2_x86_corei7=y
BR2_GCC_VERSION_5_X=y

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>