Prepend 'call' to all non-cygwin commands to prevent incredibuild from aborting the scripts early.
Prepend 'call' to all non-cygwin commands to prevent incredibuild from aborting
the scripts early.

There are three cases:
  * Command is a batch file
  * Command is an exe/com
  * Command is a builtin (to cmd.exe).
  
In the first case, call will prevent the overall command action from aborting
when multiple commands are attached to the same file (look for 'and also' in the
msvs generator).

In the second, call does not change the exe's behavior

In the third case, call still performs the requested action correctly. This even
applies to the 'call' builtin, so, 'call call echo foo' is still correct.
Review URL: https://chromiumcodereview.appspot.com/10824293

csulmone/gyp,csulmone/gyp,csulmone/gyp,csulmone/gyp