e2fsprogs: break out libcomerr/libss, FS#1310

libext2fs breaks krb5 by always installing its own copies of libcom_err.so
and libss.so.

Move the libraries into separate libcomerr and libss packages respectively
and add a host build recipe to stage the required compile_et and mk_cmds
utilities for use by other packages.

This allows the krb5 package to be fixed to use the system wide libcomerr
and libss libraries.

Signed-off-by: Andy Walsh <andy.walsh44+github@gmail.com>
[rename libcom_err to libcomerr, make compile_et and mk_cmds relocatable,
 cleanup makefile, add dependency on host build, reword commit message]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

package/utils/e2fsprogs/patches/000-relocatable.patch

@@ -0,0 +1,46 @@
+--- a/lib/et/compile_et.sh.in
++++ b/lib/et/compile_et.sh.in
+@@ -2,9 +2,15 @@
+ #
+ #
+ 
+-datarootdir=@datarootdir@
+-AWK=@AWK@
+-DIR=@datadir@/et
++if test "x$STAGING_DIR" = x ; then
++	datarootdir=@datarootdir@
++	AWK=@AWK@
++	DIR=@datadir@/et
++else
++	datarootdir="$STAGING_DIR/../hostpkg/share"
++	AWK=awk
++	DIR="$datarootdir/et"
++fi
+ 
+ if test "$1" = "--build-tree" ; then
+     shift;
+--- a/lib/ss/mk_cmds.sh.in
++++ b/lib/ss/mk_cmds.sh.in
+@@ -1,11 +1,17 @@
+ #!/bin/sh
+ #
+ #
+-
+-datarootdir=@datarootdir@
+-DIR=@datadir@/ss
+-AWK=@AWK@
+-SED=@SED@
++if test "x$STAGING_DIR" = x ; then
++	datarootdir=@datarootdir@
++	DIR=@datadir@/ss
++	AWK=@AWK@
++	SED=@SED@
++else
++	datarootdir="$STAGING_DIR/../hostpkg/share"
++	DIR="$datarootdir/ss"
++	AWK=awk
++	SED=sed
++fi
+ 
+ for as_var in \
+   LANG LANGUAGE LC_ADDRESS LC_ALL LC_COLLATE LC_CTYPE LC_IDENTIFICATION \