package/Makefile.in: set -fno-dwarf2-cfi-asm for m68k_cf

package/Makefile.in: set -fno-dwarf2-cfi-asm for m68k_cf

Another package (libsquish) is affected by the
"Internal error in emit_expr_encoded at dw2gencfi.c:215".

This error already affects 5 packages and is due to binutils, see:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79509

No report has been made to binutils yet however as suggested by Yann
during review of woff2 workaround
(https://patchwork.ozlabs.org/patch/911344/), remove the workarounds
from all these packages and put it in package/Makefile.in

Fixes:

 http://autobuild.buildroot.org/results/77e06c092f4e7804dc166e259b25e779e5f1e83a

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>