bzgrep uses !/bin/sh but then uses the bashism ${var//} so replace those

with calls to sed so POSIX shells work

http://bugs.gentoo.org/193365

--- ./bzgrep

+++ ./bzgrep

@@ -63,10 +63,9 @@

     bzip2 -cdfq "$i" | $grep $opt "$pat"

     r=$?

   else

-    j=${i//\\/\\\\}

-    j=${j//|/\\|}

-    j=${j//&/\\&}

-    j=`printf "%s" "$j" | tr '\n' ' '`

+    # the backslashes here are doubled up as we have to escape each one for the

+    # shell and then escape each one for the sed expression

+    j=`printf "%s" "${i}" | sed -e 's:\\\\:\\\\\\\\:g' -e 's:[|]:\\\\|:g' -e 's:[&]:\\\\&:g' | tr '\n' ' '`

     bzip2 -cdfq "$i" | $grep $opt "$pat" | sed "s|^|${j}:|"

     r=$?

   fi