fmtools: fix QA staging(GNU hash)
Without that fix we have:
ERROR: QA Issue with fmtools: No GNU_HASH in the elf binary: '.../work/armv7a-oe-linux-gnueabi/fmtools-1.0.2-r1/packages-split/fmtools/usr/bin/fm'
ERROR: QA Issue with fmtools: No GNU_HASH in the elf binary: '.../work/armv7a-oe-linux-gnueabi/fmtools-1.0.2-r1/packages-split/fmtools/usr/bin/fmscan'
ERROR: QA run found fatal errors. Please consider fixing them.
Note that fmtools Makefile has no way to pass the LDFLAGS to it
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>