[lld/mac] Make framework symlinks in tests more realistic

[thakis]

Summary

In a framework Foo.framework, Foo.framework/Foo is usually a relative
symbolic link to Foo.framework/Versions/Current/Foo,
and Foo.framework/Versions/Current is usually a relative symbolic
link to A.

Our tests used absolute symbolic links. Now they use relative symbolic links.

No behavior change, just makes the tests more representative of the real world.

(implicit-dylib.s omits the "Current" folder too, but I'm not changing that
here.)

[int3]

Realism is always good :)

lld/test/MachO/framework.s

 # REQUIRES: x86, shell
 # RUN: rm -rf %t; split-file %s %t
 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/foo.s -o %t/foo.o
 # RUN: mkdir -p %t/Foo.framework/Versions/A
 # RUN: %lld -dylib -install_name %t/Foo.framework/Versions/A/Foo %t/foo.o -o %t/Foo.framework/Versions/A/Foo
 # RUN: %lld -dylib -install_name %t/Foo.framework/Versions/A/Foobar %t/foo.o -o %t/Foo.framework/Versions/A/Foobar
-# RUN: ln -sf %t/Foo.framework/Versions/A %t/Foo.framework/Versions/Current
-# RUN: ln -sf %t/Foo.framework/Versions/Current/Foo %t/Foo.framework/Foo
+# RUN: ln -sf A %t/Foo.framework/Versions/Current
+# RUN: ln -sf Versions/Current/Foo %t/Foo.framework/Foo
 
 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/test.s -o %t/test.o
 # RUN: %lld -lSystem -F%t -framework Foo %t/test.o -o %t/test
 # RUN: llvm-objdump --macho --lazy-bind %t/test | FileCheck %s --check-prefix=NOSUFFIX
 # NOSUFFIX: __DATA __la_symbol_ptr 0x{{[0-9a-f]*}} {{.*}}Foo _foo
 
 # RUN: %lld -lSystem -F%t -framework Foo,baz %t/test.o -o %t/test-wrong-suffix
 # RUN: llvm-objdump --macho --lazy-bind %t/test-wrong-suffix | FileCheck %s --check-prefix=NOSUFFIX

lld/test/MachO/implicit-dylibs.s

 # RUN: %lld -dylib -lSystem %t/libfoo.o -o %t/libfoo.dylib
 # RUN: %lld -dylib -lSystem %t/libtoplevel.o -o %t/usr/lib/libtoplevel.dylib -install_name /usr/lib/libtoplevel.dylib
 # RUN: %lld -dylib -lSystem %t/libsublevel.o -o %t/usr/lib/system/libsublevel.dylib -install_name /usr/lib/system/libsublevel.dylib
 # RUN: %lld -dylib -lSystem %t/libunused.o -o %t/usr/lib/libunused.dylib -install_name /usr/lib/libunused.dylib
 
 ## Bar.framework is nested within Foo.framework.
 # RUN: %lld -dylib -lSystem %t/framework-bar.o -o %t/System/Library/Frameworks/Foo.framework/Frameworks/Bar.framework/Versions/A/Bar \
 # RUN:   -install_name /System/Library/Frameworks/Foo.framework/Frameworks/Bar.framework/Versions/A/Bar
-# RUN: ln -sf %t/System/Library/Frameworks/Foo.framework/Frameworks/Bar.framework/Versions/A/Bar \
+# RUN: ln -sf Versions/A/Bar \
 # RUN:   %t/System/Library/Frameworks/Foo.framework/Frameworks/Bar.framework/Bar
 
 ## Have Foo re-export Bar.
 # RUN: %lld -dylib -F %t/System/Library/Frameworks/Foo.framework/Frameworks \
 # RUN:   -framework Bar -sub_umbrella Bar -lSystem %t/framework-foo.o -o %t/System/Library/Frameworks/Foo.framework/Versions/A/Foo \
 # RUN:   -install_name /System/Library/Frameworks/Foo.framework/Versions/A/Foo
-# RUN: ln -sf %t/System/Library/Frameworks/Foo.framework/Versions/A/Foo %t/System/Library/Frameworks/Foo.framework/Foo
+# RUN: ln -sf Versions/A/Foo %t/System/Library/Frameworks/Foo.framework/Foo
 
 # RUN: %lld -dylib -lSystem %t/framework-baz.o -o %t/Baz.framework/Versions/A/Baz \
 # RUN:   -install_name %t/Baz.framework/Versions/A/Baz
-# RUN: ln -sf %t/Baz.framework/Versions/A/Baz %t/Baz.framework/Baz
+# RUN: ln -sf Versions/A/Baz %t/Baz.framework/Baz
 
 # RUN: %lld -dylib -syslibroot %t -framework Foo -F %t -framework Baz \
 # RUN:   -lc++ -ltoplevel -lunused %t/usr/lib/system/libsublevel.dylib %t/libfoo.dylib \
 # RUN:   -sub_library libc++ -sub_library libfoo -sub_library libtoplevel \
 # RUN:   -sub_library libsublevel -sub_library libunused \
 # RUN:   -sub_umbrella Baz -sub_umbrella Foo \
 # RUN:   %t/reexporter.o -o %t/libreexporter.dylib