deps.ffmpeg: Remove MbedTLS CMake files from macOS FFmpeg package

Once the project switches MbedTLS 3.6+, there needs to be a way to
distinguish between older and newer versions on the obs-studio side.

The path of least resistance is to use CMake package-based discovery
for versions 3.6+ and find module-based discovery for older versions,
which requires the older (current as of time of the commit) versions
to not provide a CMake package as part of obs-deps.

build-deps.zsh

@@ -87,6 +87,7 @@ package() {
 
     rm -rf -- lib/^(*.dylib|*.a|*.so*|*.lib|*.framework|*.dSYM|cmake)(N)
     rm -rf -- lib/(libpcre*|libpng*|libfreetype.a)(N)
+    rm -rf -- lib/cmake/MbedTLS(N)
     rm -rf -- bin/^(*.exe|*.dll|*.pdb|swig)(N)
 
     if [[ ${PACKAGE_NAME} == ffmpeg ]] rm -rf -- lib/*.a(N)