Revert "v8: fix "pure virtual method called" runtime error"

It makes mksnapshot die with a segmentation fault on sunos with gcc 4.5.2.

This reverts commit c21c51a6fc.

deps/v8/build/common.gypi

@@ -271,14 +271,6 @@
           }],
           [ 'v8_no_strict_aliasing==1', {
             'cflags': [ '-fno-strict-aliasing' ],
-          }, {
-            # gcc 4.4.6 has a regression in non-strict aliasing mode that
-            # makes a lookup in CodeStub::FindCodeInCache() abort with a
-            # "pure virtual method called" runtime error.
-            #
-            # This bites node.js because it sets -fno-strict-aliasing in its
-            # cflags, which then leak into our cflags.
-            'cflags!': [ '-fno-strict-aliasing' ],
           }],
         ],  # conditions
       }],