more EMUL_OPSYS supported in pkgsrc.
Add "solaris" to EmulPlatform.
In pkgsrc emul framework, "sunos" is SunOS 4.x, and "solaris" is SunOS 5.x.
Document EXTRACT_ENV
tell EXTRACT_ENV.
define JDK7 Update number in Makefile.common and use it.
remove unwanted a space.