Trace mode considers dependencies case-sensitively

[ryandesign (Ryan Carsten Schmidt)]

For example, pulseaudio declares a dependency on path:lib/libspeexdsp.dylib:speexDSP and fails to configure in trace mode because speexdsp has been hidden:

checking for  speexdsp >= 1.2 ... no
configure: error: *** speex support not found

Warning: The following existing files were hidden from the build system by trace mode:

  /opt/local/lib/pkgconfig/speexdsp.pc

Correcting the capitalization of the dependency (from speexDSP to speexdsp), which I'll commit in a moment, fixes it. While ports should use the correct case for dependencies, trace mode should consider dependencies case-insensitively.

What happened in this case was that speexDSP used to be a subport of the speex port but it was removed and replaced with a separate port capitalized speexdsp.

[ryandesign (Ryan Carsten Schmidt)]

In 846e43679eedec6814fd47bfc935eb6744506dcb/macports-ports (master):

Fix capitalization of speexdsp

See: #68637

speexDSP-devel was deleted years ago so there is no longer any reason to
depend on speexDSP via a path:-style dependency.

[jmroot (Joshua Root)]

In 6ff075f67830d04e52deff1d53d30ae61b335036/macports-base (master):

trace mode: treat port names case-insensitively

Also avoid linear searches while collecting deps, and allow passing an
empty list to tracelib setdeps.

Closes: #68637