Enable building V8 for Android on Mac

Enable building V8 for Android on Mac

Committed: https://code.google.com/p/v8/source/detail?r=12172

[haitao.feng, 2012-07-20 14:57:04]

Enable building V8 for Android on Mac.

Basically choose the functions working on both Linux and Mac. Verified on Linux
Ubuntu 12.04 64 bits and Mac Lion 10.7.4.

1) Use make-android flavor for both Linux and Mac.
2) "readlink -f" does not work on Mac. Use ${PWD} directly.
3) "${MODE[@]^}" does not work on Mac. Use implementation in main Makefile.
4) It is strange that "echo -n "-m32"" on Mac generates "-n -m32" and on Linux
generates "-m32". IA32 cross compiler fails because of the extra "-n". As
removing -n works for both Linux and Mac, I did not spend time to debug gyp to
find the root cause.
5) Fix a typo in Makefile.

Jakob, please help to add exec permission to the android-build.sh.

[haitao.feng, 2012-07-23 01:05:52]

Add some comments and refine the error message from android-build.sh.

For the "-n" issue: "-n" is unnecessary; here is the codes from
gyp/pylib/gyp/input.py:697:  replacement = p_stdout.rstrip(). If you really want
to use it, you might need to follow gyp document at
http://code.google.com/p/gyp/wiki/InputFormatReference#Command_Expansions_(<!...:
  'files': '<!(["ls", "-1", "Filename With Spaces"])',

Now the V8 for Android building is completely done as V8 building on Windows
does not require Makefile. As there is no windows OS definition in
tools/gyp/v8.gyp for mksnapshot, I suspect there might be some extra work to
build V8 for Android on Windows. I leave Windows build to the other interested
developers :)

*.check does not work as md5sum does not exist on Mac. Manually cp
d8/cctest/preprocess to devices and comment sync rules works. So there is no
problem on building. I will submit another CL today to fix the problem of
android-sync.sh as there is md5 program on Mac.

[haitao.feng, 2012-07-23 09:04:34]

Remove tailing space and split long lines in build/common.gypi.

[Jakob Kummerow, 2012-07-23 11:29:05]

LGTM, I'll land.

[Jakob Kummerow, 2012-07-23 11:31:14]

Actually, the line breaks in common.gypi in patch set 3 do not look good to me.
I've tried the same thing before, and it broke compilation on Windows. So I'll
have to undo those changes before landing.