Add yet another tcl search path for macOS

[michaelortmann]

Found by: michaelortmann
Patch by: michaelortmann
Fixes:

One-line summary:
Add yet another tcl search path for macOS

Additional description (if needed):
On my newly installed macOS, eggdrop still doesnt find tclConfig.sh
Even after #1649
When i looked for it, i found Tcl is installed but Xcode (where eggdrop searches) is not:

$ ls -la /Applications
total 0
drwxrwxr-x   5 root  admin  160 Jul 19 04:41 .
drwxr-xr-x  20 root  wheel  640 Jul 19 04:41 ..
-rw-r--r--   1 root  wheel    0 Jul 19 04:41 .localized
lrwxr-xr-x@  1 root  wheel   54 Jul 19 04:41 Safari.app -> ../System/Cryptexes/App/System/Applications/Safari.app
drwxr-xr-x   3 root  wheel   96 Jul 19 04:41 Utilities

So this PR adds yet another search path, and voila, looks like eggdrop is not dependent on Xcode anymore :)

Test cases demonstrating functionality (if applicable):

$ uname -a
Darwin michaels-iMac-Pro.local 22.6.0 Darwin Kernel Version 22.6.0: Mon Jun 24 01:25:37 PDT 2024; root:xnu-8796.141.3.706.2~1/RELEASE_X86_64 x86_64

This is macOS 13.6.8

configure: Autoconfiguring Tcl with tclConfig.sh
checking for correct TEA configuration... ok (TEA 3.10)
configure: configuring Eggdrop 1.10.0
checking for Tcl configuration... found /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Tcl.framework/tclConfig.sh
checking for existence of /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Tcl.framework/tclConfig.sh... loading
checking platform... unix
checking for sin... yes
checking for main in -lieee... no
checking for main in -linet... no
checking for net/errno.h... no
checking for connect... yes
checking for gethostbyname... yes
checking for Tcl linker... ${CC} -dynamiclib ${CFLAGS} ${LDFLAGS} -Wl,-single_module
checking for Tcl version... 8.5.9
checking for Tcl library flags... -F/System/Library/Frameworks -framework Tcl -lpthread -framework CoreFoundation
checking for Tcl header flags... -iwithsysroot /System/Library/Frameworks/Tcl.framework/Versions/8.5/Headers
checking whether C compiler accepts -Og... yes
checking for system IPv6 support... yes
checking for struct in6_addr... yes
checking for the in6addr_any constant... yes
checking for the in6addr_loopback constant... yes
checking for struct sockaddr_in6... yes
checking whether to enable TLS support... no
configure: creating ./config.status
config.status: creating Makefile
config.status: creating doc/Makefile
config.status: creating scripts/Makefile
config.status: creating src/Makefile
config.status: creating src/compat/Makefile
config.status: creating src/md5/Makefile
config.status: creating src/mod/Makefile
config.status: creating config.h
config.status: executing eggint.h commands
config.status: creating eggint.h : __EGGINT_H
config.status: executing replace-if-changed commands
creating lush.h
config.status: executing catch-make-rebuild commands

Operating System: Darwin 22.6.0
IPv6 Support: yes
Tcl version: 8.5.9 (threaded)

and it fully compiled :)