woff2: fix build on m68k

Same issue on woff2 than in some other packages such as lcdapi: see
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79509

Fixes:
 - http://autobuild.buildroot.net/results/6c97a08e6ca2e914d54fbb525b3f0bb90023ef07

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

package/woff2/woff2.mk

@@ -21,4 +21,10 @@ ifneq ($(BR2_SHARED_LIBS),y)
 WOFF2_CONF_OPTS += -DCMAKE_SKIP_RPATH=ON
 endif
 
+# Internal error, aborting at dw2gencfi.c:215 in emit_expr_encoded
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79509
+ifeq ($(BR2_m68k_cf),y)
+WOFF2_CONF_OPTS += -DCMAKE_CXX_FLAGS="$(TARGET_CXXFLAGS) -fno-dwarf2-cfi-asm"
+endif
+
 $(eval $(cmake-package))