lib/unistr/u8-uctomb.c fails to compile

[Andreas Schwab]

../../grep/lib/unistr/u8-uctomb.c: In function 'u8_uctomb':
../../grep/lib/unistr/u8-uctomb.c:64:65: error: this statement may fall through 
[-Werror=implicit-fallthrough=]
             case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000;
                                                              ~~~^~~~~~~~~~
../../grep/lib/unistr/u8-uctomb.c:65:13: note: here
             case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800;
             ^~~~
../../grep/lib/unistr/u8-uctomb.c:65:65: error: this statement may fall through 
[-Werror=implicit-fallthrough=]
             case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800;
                                                              ~~~^~~~~~~~
../../grep/lib/unistr/u8-uctomb.c:66:13: note: here
             case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0;
             ^~~~
cc1: all warnings being treated as errors

Andreas.

-- 
Andreas Schwab, SUSE Labs, address@hidden
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"And now for something completely different."