Eliminate HAVE_ZLIB everywhere. See [1210ec8424] #4567

Job	Run time
gcc	12m 41s
gcc (CFLAGS=-DTCL_NO_DEPRECATED=1)	12m 31s
msvc	10m 20s
gcc (--disable-shared)	12m 39s
msvc (CHECKS=nodep)	10m 4s
gcc (--disable-zipfs)	12m 19s
msvc (OPTS=static)	10m 45s
msvc (OPTS=noembed)	10m 5s
msvc (OPTS=symbols)	10m 43s
gcc (--enable-symbols)	12m 53s
msvc (OPTS=symbols STATS=compdbg,memdbg)	14m 58s
gcc (--enable-symbols=mem)	14m 25s
gcc (--enable-symbols=all)	15m 41s
	2h 40m 4s

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