test fix: TestLoadUsingPaths should use realpath

[lawrence_danna]

Summary

TestLoadUsingPaths will fail if the build directory has
symlinks in its path, because the real paths reported by
the debugger won't match the symlink-laden paths it's expecting.

This can be solved just by using os.path.realpath on the base
path for the test.

lldb/trunk/packages/Python/lldbsuite/test/functionalities/load_using_paths/TestLoadUsingPaths.py

def setUp(self):
         # Invoke the default build rule.
         self.build()
 
         ext = 'so'
         if self.platformIsDarwin():
             ext = 'dylib'
         self.lib_name = 'libloadunload.' + ext
 
-        self.wd = self.getBuildDir()
+        self.wd = os.path.realpath(self.getBuildDir())
         self.hidden_dir = os.path.join(self.wd, 'hidden')
         self.hidden_lib = os.path.join(self.hidden_dir, self.lib_name)
 
     @skipIfFreeBSD  # llvm.org/pr14424 - missing FreeBSD Makefiles/testcase support
     @not_remote_testsuite_ready
     @skipIfWindows  # Windows doesn't have dlopen and friends, dynamic libraries work differently
     @expectedFlakeyNetBSD
     def test_load_using_paths(self):