issue-628:package missing stacktrace_powerpc-{linux,darwin}-inl.h

This headers were missing in .tar.gz because they were not mentioned
anywhere in Makefile.am.
applied chromium patch fixing some build issue on android

This applies patch from: https://codereview.chromium.org/284843002/ by
jungjik.lee@samsung.com
updated NEWS for 2.2.1
bumped version to 2.2.1
issue-631: fixed miscompilation of debugallocation without mmap

This applies patch sent by user iamxujian.

Clearly, when I updated debugallocation to fix issue-464 I've broken
no-mmap path by forgetting closing brace.
issue-630: The env var should be "CPUPROFILE"

To enable cpu profile, the env var should be "CPUPROFILE", not "PROFILE"
actually.

Signed-off-by: Aliaksey Kandratsenka <alk@tut.by>
added option to display stack traces in output for heap checker

Quoting from email:

I had the same question as William posted to stack overflow back on
Dec 9,2013: How to display symbols in stack trace of google-perftools
heap profiler (*).  I dug into the source and realized the
functionality was not there but could be added. I am hoping that
someone else will find this useful/helpful.

The patch I created will not attach so I am adding below.

Enjoy!

-- Michael

* http://stackoverflow.com/questions/20476918/how-to-display-symbols-in-stack-trace-of-google-perftools-heap-profiler
issue-636: fix prof/web command on Windows/MinGW

This applies patch sent by user chaishushan.
issue-635: allow whitespace in libraries paths

This applies change suggested by user mich...@sebesbefut.com
Add an option to allow disabling stripping template argument in pprof