replace platform conditions with os_posix and os_bsd where applicable

crypto/crypto.gyp

Index: crypto/crypto.gyp
diff --git a/crypto/crypto.gyp b/crypto/crypto.gyp
index 2b3ec73fd0b57388805383eebf473108852ffa5e..1461b957f7c7c8b30f721df8cc296b0f09742798 100644
--- a/crypto/crypto.gyp
+++ b/crypto/crypto.gyp
@@ -52,7 +52,7 @@
               ['exclude', 'ec_private_key_nss\.cc$'],
             ],
         }],
-        [ 'OS == "freebsd" or OS == "openbsd"', {
+        [ 'os_bsd==1', {

[wtc, 2011/11/30 01:08:15]

Nit: the prevalent style in this file has spaces before and
after ==.  (It's not worth fixing this.  Just for future
reference.)

           'link_settings': {
             'libraries': [
               '-L/usr/local/lib -lexecinfo',