package/uclibc: fix build on thumb2-only arm cpus

package/uclibc: fix build on thumb2-only arm cpus

Add a patch to revert an upstream commit that broke building for armv7
thumb2-only CPUs.

Commit pointed out by Thomas.

Fixes:
    https://travis-ci.org/buildroot/buildroot-defconfig-testing/jobs/150333657
    https://travis-ci.org/buildroot/buildroot-defconfig-testing/jobs/150333658
    ... and all the other atmel_sama5d* defconfigs
    https://travis-ci.org/buildroot/buildroot-defconfig-testing/jobs/150333643
    https://travis-ci.org/buildroot/buildroot-defconfig-testing/jobs/150333644

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>