add nspr library
Merge branch 'wp8' of https://github.com/joshuastray/Spidermonkey into wp8
Merge branch 'wp8' of https://github.com/joshuastray/Spidermonkey into wp8
Merge branch 'wp8' of https://github.com/joshuastray/Spidermonkey into wp8
Merge branch 'wp8' of https://github.com/joshuastray/Spidermonkey into wp8
Merge branch 'wp8' of https://github.com/joshuastray/Spidermonkey into wp8
compiling