Add explicit Release configuration to standalone.gypi to appease Xcode.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/12225043

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@13602 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Do not rely on secure API functions when using MinGW-w64

Windows XP does not provide secure API functions in msvcrt.dll but
newer versions of Windows do. Avoid using secure API functions for
compatibility with msvcrt.dll on Windows XP.

Contributed by net147@gmail.com

BUGS=
TEST=

Review URL: https://chromiumcodereview.appspot.com/12189010
Patch from Jonathan Liu <net147@gmail.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@13603 ce2b1a6d-e550-0410-aec6-3dcde31c8c00