Merge r1636 from trunk to bleeding edge.

Changelist http://codereview.chromium.org/56056 was committed directly to trunk by addident.
Review URL: http://codereview.chromium.org/60005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1662 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

SConstruct

@@ -107,6 +107,9 @@ LIBRARY_FLAGS = {
     },
     'os:linux': {
       'CCFLAGS':      ['-ansi'],
+      'library:shared': {
+        'LIBS': ['pthread', 'rt']
+      }
     },
     'os:macos': {
       'CCFLAGS':      ['-ansi'],