[icu] has wrong install name in arm64-osx-dynamic triplet

[liviaerxin]

Describe the bug
A clear and concise description of what the bug is.

Environment

• OS: arm64 osx
• Compiler: clang

To Reproduce
Steps to reproduce the behavior:

1. vcpkg remove icu:arm64-osx-dynamic
2. vcpkg install icu --host-triplet=arm64-osx-dynamic --triplet=arm64-osx-dynamic --no-binarycaching
   Repro code when

Expected behavior

/opt/vcpkg/buildtrees/icu/arm64-osx-dynamic-dbg/lib/libicui18n.dylib should have install name of@rpath/libicui18n.72.dylib

Current behavior

❯ otool -L /opt/vcpkg/buildtrees/icu/arm64-osx-dynamic-dbg/lib/libicui18n.dylib
/opt/vcpkg/buildtrees/icu/arm64-osx-dynamic-dbg/lib/libicui18n.dylib:
	libicui18n.72.dylib (compatibility version 72.0.0, current version 72.1.0)
	libicuuc.72.dylib (compatibility version 72.0.0, current version 72.1.0)
	libicudata.72.dylib (compatibility version 72.0.0, current version 72.1.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1319.0.0)
	/usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 1300.36.0)

Additional context

However, libicui18n.dylib in release mode, which is all right as expected:

❯ otool -L /opt/vcpkg/buildtrees/icu/arm64-osx-dynamic-rel/lib/libicui18n.dylib
/opt/vcpkg/buildtrees/icu/arm64-osx-dynamic-rel/lib/libicui18n.dylib:
	@rpath/libicui18n.72.dylib (compatibility version 72.0.0, current version 72.1.0)
	@rpath/libicuuc.72.dylib (compatibility version 72.0.0, current version 72.1.0)
	@rpath/libicudata.72.dylib (compatibility version 72.0.0, current version 72.1.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1319.0.0)
	/usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 1300.36.0)