Unconditionally allow p{read,write}{,v}().
Unconditionally allow p{read,write}{,v}().

TEST=make test, also run browser_tests in Chrome
BUG=http://code.google.com/p/chromium/issues/detail?id=89114
Review URL: http://codereview.chromium.org/7387002
cnbird1999/seccompsandbox,ericmckean/seccompsandbox,cnbird1999/seccompsandbox,ericmckean/seccompsandbox,cnbird1999/seccompsandbox,ericmckean/seccompsandbox