Fix libgloss being built for disabled multilibs

Target libraries are considered to be built for GCC's "host", not GCC's
"target".  The "host" variable must be set by configure scripts using
"config-ml.in" to determine multilib support, otherwise disabled
multilibs (specified as a configure argument with --disable-<multilib>)
will still be built for the subdirectories those configure scripts
reside in.

libgloss/configure

@@ -3883,6 +3883,7 @@ cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 AMDEP_TRUE="$AMDEP_TRUE" ac_aux_dir="$ac_aux_dir"
 srcdir=${srcdir}
 target=${target}
+host=${host}
 with_multisubdir=${with_multisubdir}
 ac_configure_args="--enable-multilib ${ac_configure_args}"
 CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}

libgloss/configure.in

@@ -229,6 +229,7 @@ AC_CONFIG_FILES([Makefile],
 fi],
 srcdir=${srcdir}
 target=${target}
+host=${host}
 with_multisubdir=${with_multisubdir}
 ac_configure_args="--enable-multilib ${ac_configure_args}"
 CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}