Utility: fixed NaClStreamBuffer compilation.
package: build both deprecated and non-deprecated Emscripten version.
package: do Emscripten build with less threads.

It's taking too much RAM otherwise.
package: initial NaCl Jenkins configuration.

Not working on master, as the x86 builds require compatibility branch
for GCC 4.4.
Merge branch 'master' into compatibility
package: use compatibility branch for NaCl Emscripten build.