[PATCH] [analyzer] Prevent ccc/c++-analyzer from hanging on Windows.

[Антон Ярцев]

Updated the patch.
The patch now includes the fix for D9357 <http://reviews.llvm.org/D9357> that happen to be related to this issue. Perl 'system' and 'exec' routines process arguments differently depending on the perl port (tested with MSYS Perl, Dwimperl, Strawberry Perl and ActiveState Perl, got different results in terms of processing quotes and escaped characters) and on the OS (because arguments are passed to the system's command shell for parsing). 
The patch replaces all 'exec' and 'system' calls with pipe form of 'open' that behaves consistently in all tested perl ports and operating systems (Windows 7, OS X, Ubuntu).
Tested with arguments like -DMACRO="\"'A=a' 'B=b'\"" and -DMACRO='"include.h"'.
Please review!

In http://reviews.llvm.org/D8774#187749, @sylvestre.ledru wrote:

> I am not sure what is going on but a rebuild without your patch works


Fixed issues, please test it once again.


http://reviews.llvm.org/D8774

Files:
  tools/scan-build/ccc-analyzer
  tools/scan-build/scan-build

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