i386, x86_64, ppc: fix switch fallthrough cases with GCC7

In util/getroot and efidisk slightly modify exitsing comment to mostly
retain it but still make GCC7 compliant with respect to fall through
annotation.

In grub-core/lib/xzembed/xz_dec_lzma2.c it adds same comments as
upstream.

In grub-core/tests/setjmp_tets.c declare functions as "noreturn" to
suppress GCC7 warning.

In grub-core/gnulib/regexec.c use new __attribute__, because existing
annotation is not recognized by GCC7 parser (which requires that comment
immediately precedes case statement).

Otherwise add FALLTHROUGH comment.

Closes: 50598

grub-core/video/ieee1275.c

@@ -181,6 +181,7 @@ grub_video_ieee1275_fill_mode_info (grub_ieee1275_phandle_t dev,
     case 32:
       out->reserved_mask_size = 8;
       out->reserved_field_pos = 24;
+      /* FALLTHROUGH */
 
     case 24:
       out->red_mask_size = 8;