Fix NaCl build error with ninja.
Fix NaCl build error with ninja.

Fix source-tree paths passed to compiler and linker flags of nacl_helper_bootstrap so that they are correct when building with ninja.

BUG=None
TEST=Manual: nacl_helper_bootstrap target should build both with make and ninja.


Review URL: http://codereview.chromium.org/7828095

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@99796 0039d316-1c4b-4281-b951-d872f2087c98

ropik/chromium,ropik/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium