stop Xcode tools from overriding deps when CLT is not installed

Closes #30641.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
libunwind-headers: add 35.1 bottle.
libusrsctp: add 0.9.1 bottle.
libutf: add 20110530 bottle.
libuvc: add 0.0.3 bottle.
libvbucket: add 1.8.0.4 bottle.
libvidstab: add 0.98b bottle.
libvo-aacenc: add 0.1.2 bottle.
libvoikko: add 3.7 bottle.
libvpx: add 1.3.0 bottle.
libwbxml: add 0.11.2 bottle.
libwebsockets: add 1.23 bottle.
libwmf: add 0.2.8.4_1 bottle.
libxc: add 2.2.0 bottle.
libxdiff: add 0.23 bottle.
libxmi: add 1.2 bottle.
libxml++: add 2.34.2 bottle.
libxmlsec1: add 1.2.19_1 bottle.
libxmp: add 4.2.7 bottle.
libxslt: add 1.1.28 bottle.