Adds support for compiling OpenSSL on mac.

openssl.gyp

Index: openssl.gyp
diff --git a/openssl.gyp b/openssl.gyp
index 30a1b27cc109a10dabbe4c5da76ba49f29422503..1eb08d5ba6e6efb053fddb3489c61aa36cf917b9 100644
--- a/openssl.gyp
+++ b/openssl.gyp
@@ -59,12 +59,27 @@
           'defines': [ '<@(openssl_mips_defines)' ],
           'defines!': [ 'OPENSSL_NO_ASM' ],
         }],
-        ['target_arch == "ia32"', {
+        ['target_arch == "ia32" and OS !="mac"', {
           'sources': [ '<@(openssl_x86_sources)' ],
           'sources!': [ '<@(openssl_x86_source_excludes)' ],
           'defines': [ '<@(openssl_x86_defines)' ],
           'defines!': [ 'OPENSSL_NO_ASM' ],
         }],
+        ['target_arch == "ia32" and OS == "mac"', {
+          'sources': [ '<@(openssl_mac_ia32_sources)' ],
+          'sources!': [ '<@(openssl_mac_ia32_source_excludes)' ],
+          'defines': [ '<@(openssl_mac_ia32_defines)' ],
+          'defines!': [ 'OPENSSL_NO_ASM' ],
+          'variables': {
+            # Ensure the 32-bit opensslconf.h header for OS X is used.
+            'openssl_include_dirs+': [ 'config/mac/ia32' ],
+            'openssl_public_include_dirs+': [ 'config/mac/ia32' ],
+          },
+          'xcode_settings': {
+            # Clang needs this to understand the inline assembly keyword 'asm'.
+            'GCC_C_LANGUAGE_STANDARD': 'gnu99',
+          },
+        }],
         ['target_arch == "x64"', {
           'sources': [ '<@(openssl_x86_64_sources)' ],
           'sources!': [ '<@(openssl_x86_64_source_excludes)' ],