gmp 6 pbulk error

[Jason Bacon <bacon4000%gmail.com@localhost>]

In 2017Q3, seems to be missing a bzcat build dependency.  I would think

EXTRACT_SUFX=     .tar.bz2

would cover this, but I got the following error in my pbulk build.  
gcc48, 49, 5, and 7 all built successfully.

===> Extracting for gcc6-6.4.0nb1
(cd ../../devel/gmp && /sharedapps/pkg-2017Q3/bin/bmake 
WRKDIR=/tmp/pkgbuild/lan
g/gcc6/work/gcc-6.4.0/.devel.gmp 
EXTRACT_DIR=/tmp/pkgbuild/lang/gcc6/work/gcc-6.
4.0  WRKSRC='${EXTRACT_DIR}/${DISTNAME:C/a$//}' SKIP_DEPENDS=YES patch)
===> Overriding tools for gmp-6.1.2
===> Extracting for gmp-6.1.2
/sharedapps/pkgsrc-2017Q3/mk/extract/extract: line 284: 
/sharedapps/pkg-2017Q3/b
in/bzcat: No such file or directory
/bin/tar: This does not look like a tar archive
/bin/tar: Exiting with failure status due to previous errors
*** Error code 2

Stop.
bmake[2]: stopped in /sharedapps/pkgsrc-2017Q3/devel/gmp
*** Error code 1

Stop.
bmake[1]: stopped in /sharedapps/pkgsrc-2017Q3/lang/gcc6
*** Error code 1

Stop.

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