Linux

Fix gcc 13.2.1 (Fedora 39.1) warning: Writing of 1 byte into a region… #4109

Job	Run time
gcc	3m 35s
gcc (--disable-shared)	3m 46s
gcc (--enable-symbols)	3m 29s
gcc (--enable-symbols=mem)	4m 15s
gcc (--enable-symbols=all)	5m 6s
gcc (CFLAGS=-ftrapv)	3m 47s
gcc (CFLAGS=-DTCL_UTF_MAX=4)	3m 37s
gcc (CFLAGS=-DTCL_UTF_MAX=6)	3m 40s
gcc (CFLAGS=-m32 CPPFLAGS=-m32 LDFLAGS=-m32 --disable-64bit)	3m 58s
	35m 13s

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