6673277: Thread unsafe lazy initialization code in sun.security.provider.certpath.*Checker classes
Summary: make supportedExts variable non-static
Reviewed-by: vinnie
cfeea66a3fa8ca3686a7cfa2d0ce8ab0169f168d jdk7-b24
cbc8ad9dd0e085a607427ea35411990982f19a36 jdk7-b25
9410f77cc30c604d1caf7c9fe3a57fa19e1acbe8 jdk7-b26