brother-brscan4: remove custom do_extract

srcpkgs/brother-brscan4/template

@@ -3,7 +3,6 @@ pkgname=brother-brscan4
 version=0.4.9
 revision=1
 archs="i686 x86_64"
-hostmakedepends="rpmextract"
 depends="sane"
 short_desc="SANE scanner driver for brscan4-compatible printers"
 maintainer="Martijn van Buul <martijn.van.buul@gmail.com>"
@@ -32,10 +31,6 @@ else
 	_rpmlibdir="usr/lib"
 fi
 
-do_extract() {
-	rpmextract ${XBPS_SRCDISTDIR}/${pkgname}-${version}/brscan4-${version}-${_rpmpkgid}.rpm
-}
-
 do_install() {
 	# binary package makes a fine mess of things, and installs stuff in very
 	# unwieldly locations. Some of this cannot be avoided.