[libb2] uses wrong install name in arm64-osx-dynamic triplet

[liviaerxin]

Describe the bug
[libb2] uses an absolute install name in arm64-osx-dynamic triplet

Environment

• OS: arm64 osx
• Compiler: clang

To Reproduce
Steps to reproduce the behavior:

1. vcpkg remove libb2:arm64-osx-dynamic
2. vcpkg install libb2 --host-triplet=arm64-osx-dynamic --triplet=arm64-osx-dynamic --no-binarycaching

Current behavior

❯ otool -L /opt/vcpkg/packages/libb2_arm64-osx-dynamic/lib/libb2.dylib
/opt/vcpkg/packages/libb2_arm64-osx-dynamic/lib/libb2.dylib:
	/opt/vcpkg/installed/arm64-osx-dynamic/lib/libb2.1.dylib (compatibility version 2.0.0, current version 2.4.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1319.0.0)

Expected behavior

❯ otool -L /opt/vcpkg/packages/libb2_arm64-osx-dynamic/lib/libb2.dylib
/opt/vcpkg/packages/libb2_arm64-osx-dynamic/lib/libb2.dylib:
	@rpath/libb2.1.dylib (compatibility version 2.0.0, current version 2.4.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1319.0.0)

and includes @loader_path as its @rpath.

❯ otool -l /opt/vcpkg/packages/libb2_arm64-osx-dynamic/lib/libb2.dylib | grep -A5 LC_RPATH
          cmd LC_RPATH
      cmdsize 32
         path @loader_path (offset 12)

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