Modify gyp to only build executables as shared libraries on Android

Modify gyp to only build executables as shared libraries on Android

Previously, all "console" targets became shared libraries, including phony
targets intented just to build other executables.  Only change the build type
of executables --> shared libraries.  This causes the 'tools' executables to
properly build as shared libs.
Committed: https://code.google.com/p/skia/source/detail?r=4451

[EricB, 2012-07-03 15:30:54]

Need to follow this with http://codereview.appspot.com/6353066/

[DerekS, 2012-07-03 15:57:39]

On 2012/07/03 15:30:54, EricB wrote:
> Need to follow this with http://codereview.appspot.com/6353066/

lgtm

[epoger, 2012-07-09 13:57:24]

http://codereview.appspot.com/6353065/diff/1/gyp/skia_android.gypi
File gyp/skia_android.gypi (right):

http://codereview.appspot.com/6353065/diff/1/gyp/skia_android.gypi#newcode55
gyp/skia_android.gypi:55: ['_type == "executable"', {
Where does this _type variable come from?  Is it special gyp magic?

This is the only place where we refer to it...
$ grep -r _type android/gyp/*
android/gyp/skia_android.gypi:          ['_type == "executable"', {

[EricB, 2012-07-09 14:02:51]

On 2012/07/09 13:57:24, epoger wrote:
> http://codereview.appspot.com/6353065/diff/1/gyp/skia_android.gypi
> File gyp/skia_android.gypi (right):
> 
> http://codereview.appspot.com/6353065/diff/1/gyp/skia_android.gypi#newcode55
> gyp/skia_android.gypi:55: ['_type == "executable"', {
> Where does this _type variable come from?  Is it special gyp magic?
> 
> This is the only place where we refer to it...
> $ grep -r _type android/gyp/*
> android/gyp/skia_android.gypi:          ['_type == "executable"', {

This is indeed gyp magic.  From the documentation:
http://code.google.com/p/gyp/wiki/InputFormatReference#Variables

Read the 'automatic variables' bullet point.  This is an automatically-defined
variable which refers to the target type that we've specified.