Log Message:
Update devel/ccache to 2.3nb1.  Changes from version 2.3 include adding
a new environment variable CCACHE_HASHCC whose value may be used to
override the compiler-specific addition to the hash value used to
distinguish between two compiles.  This is useful where the compiler is
a shell script generated on-the-fly that executes the real compiler.
This allows ccache to function correctly within the pkgsrc
infrastructure.