Even when building against Tcl8, PRJLIBNAME9 should not have the "t" … #4561

Job	Run time
gcc	3m 53s
gcc (CFLAGS=-DTCL_NO_DEPRECATED=1)	3m 43s
gcc (--disable-shared)	3m 51s
gcc (--disable-zipfs)	3m 39s
gcc (--enable-symbols)	3m 44s
gcc (--enable-symbols=mem)	5m 9s
gcc (--enable-symbols=all)	6m 25s
gcc (CFLAGS=-ftrapv)	3m 53s
gcc (CFLAGS=-m32 CPPFLAGS=-m32 LDFLAGS=-m32 --disable-64bit)	4m 10s
	38m 27s

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