Linux

Fix [16e25e1402]: tcl_startOfPreviousWord cannot handle "end-1" #4083

Job	Run time
gcc	3m 36s
gcc (--disable-shared)	3m 36s
gcc (--enable-symbols)	3m 29s
gcc (--enable-symbols=mem)	4m 11s
gcc (--enable-symbols=all)	4m 23s
gcc (CFLAGS=-ftrapv)	3m 51s
gcc (CFLAGS=-DTCL_UTF_MAX=4)	3m 43s
gcc (CFLAGS=-DTCL_UTF_MAX=6)	3m 36s
gcc (CFLAGS=-m32 CPPFLAGS=-m32 LDFLAGS=-m32 --disable-64bit)	4m 12s
	34m 37s

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