dirty fix for unaligned access.

src/gfx16.c

@@ -3050,6 +3050,7 @@ _ROP_##rop##half \
                      "    bmi     2f				\n"
                      "    mov     r1, r0	\n"
                      "    mov     r2, r0	\n"
+                     "    bic     %[p], #3 \n"
 
                      "1:	\n"
                      "    subs    %[width], %[width], #8	\n"
@@ -3059,6 +3060,7 @@ _ROP_##rop##half \
                      "2:	\n"
                      "    tst     %[width], #1		\n"
                      "    strneh  %[back], [%[p]], #2	\n"
+                     "    bic     %[p], #3 \n"
 
                      "    tst     %[width], #2		\n"
                      "    strne   %[back], [%[p]], #4	\n"