Fixing undefined pthread undefined references in nacl.

This has been failing consistently on Linux Clang (dbg)
http://build.chromium.org/p/chromium.linux/builders/Linux%20Clang%20%28dbg%29/builds/36114/steps/compile/logs/stdio
And one of my CLs has been tickling this on the Linux 64 builder as well.
http://build.chromium.org/p/chromium/builders/Linux%20x64/builds/41425/steps/compile/logs/stdio

With the following error:

init.c:(.text+0x3c): undefined reference to `__libc_setup_tls'
init.c:(.text+0x2e2): undefined reference to `_dl_init_static_tls'
init.c:(.text+0x2ec): undefined reference to `_dl_wait_lookup_done'

It seems that using -lpthread instead of -pthread seems to be causing this
issue, but it is strangely inconsistent (except on linux clang builders).

BUG=none
[email protected]

Review URL: https://codereview.chromium.org/11411076

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@168621 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/ppapi/ppapi_untrusted.gyp b/ppapi/ppapi_untrusted.gyp
index 9f14e122..6c65987 100644
--- a/ppapi/ppapi_untrusted.gyp
+++ b/ppapi/ppapi_untrusted.gyp
@@ -77,7 +77,7 @@
         'link_flags': [
           '-lppapi_cpp',
           '-lppapi',
-          '-lpthread',
+          '-pthread',
         ],
         # TODO(bradchen): get rid of extra_deps64 and extra_deps32
         # once native_client/build/untrusted.gypi no longer needs them.