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bug#32230: 27.0.50; GCC 7 warning due to -Wformat-overflow

From: Ken Brown
Subject: bug#32230: 27.0.50; GCC 7 warning due to -Wformat-overflow
Date: Fri, 20 Jul 2018 18:02:07 -0400
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

The Cygwin-w32 build has turned up another GCC 7 warning:

../../master/src/w32term.c: In function ‘x_draw_glyph_string’:
../../master/src/w32term.c:1477:27: warning: ‘__builtin___sprintf_chk’ may write a terminating nul past the end of the destination [-Wformat-overflow=]
    sprintf ((char *) buf, "%0*X",
../../master/src/w32term.c:1477:4: note: ‘__builtin___sprintf_chk’ output between 5 and 8 bytes into a destination of size 7
    sprintf ((char *) buf, "%0*X",
The method that Paul used in bug#32189 could be used here too, but I'm
not sure it's worth the trouble.  My inclination is to just increase the
buffer size from 7 to 8.


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