Merge pull request #49 from modocache/linux-build-script-test

[Tests] Properly link Linux tests

Author: Mike Ferris

Tests/Functional/lit.cfg

@@ -33,6 +33,8 @@ swift_exec = [
     _getenv('SWIFT_EXEC'),
     '-Xlinker', '-rpath',
     '-Xlinker', built_products_dir,
+    '-L', built_products_dir,
+    '-I', built_products_dir,
 ]
 
 if platform.system() == 'Darwin':
@@ -48,8 +50,6 @@ if platform.system() == 'Darwin':
     swift_exec.extend([
         '-sdk', sdk_root,
         '-target', target,
-        '-L', built_products_dir,
-        '-I', built_products_dir,
         '-F', built_products_dir,
     ])