[lld][test] Remove /usr/local/lib test requirement

This field only exists if the directory exists on the machine running
the test. It likely exists for most Intel macOS users because of
homebrew, but doesn't exist on some of the CI machines. This
unfortunately makes this test a bit less strict.

Differential Revision: https://reviews.llvm.org/D111361

Author: keith

lld/test/MachO/search-paths-darwin.test

@@ -7,8 +7,7 @@ RUN: not ld64.lld -arch x86_64 -v -L%t1 -F%t2 2>&1 | FileCheck -DLDIR=%t1 -DFDIR
 CHECK:      Library search paths:
 CHECK-NEXT: [[LDIR]]
 CHECK-NEXT: /usr/lib
-CHECK-NEXT: /usr/local/lib
-CHECK-NEXT: Framework search paths:
+CHECK: Framework search paths:
 CHECK-NEXT: [[FDIR]]
 CHECK-NEXT: /Library/Frameworks
 CHECK-NEXT: /System/Library/Frameworks