configure: compute derivatives of target name in meson

Several CONFIG_* symbols in config-target.mak are easily computed from just
the target name.  We do not need them in config-target.mak, and can instead
place them in the config_target dictionary only.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/configure b/configure
index 2133239..7058ac1 100755
--- a/configure
+++ b/configure
@@ -7599,7 +7599,6 @@
 
 target_arch_name="$(upper $TARGET_ARCH)"
 echo "TARGET_$target_arch_name=y" >> $config_target_mak
-echo "TARGET_NAME=$target_name" >> $config_target_mak
 echo "TARGET_BASE_ARCH=$TARGET_BASE_ARCH" >> $config_target_mak
 if [ "$TARGET_ABI_DIR" = "" ]; then
   TARGET_ABI_DIR=$TARGET_ARCH
@@ -7617,21 +7616,15 @@
   echo "TARGET_WORDS_BIGENDIAN=y" >> $config_target_mak
 fi
 if test "$target_softmmu" = "yes" ; then
-  echo "CONFIG_SOFTMMU=y" >> $config_target_mak
   if test "$mttcg" = "yes" ; then
     echo "TARGET_SUPPORTS_MTTCG=y" >> $config_target_mak
   fi
 fi
 if test "$target_user_only" = "yes" ; then
-  echo "CONFIG_USER_ONLY=y" >> $config_target_mak
-  echo "CONFIG_QEMU_INTERP_PREFIX=\"$interp_prefix1\"" >> $config_target_mak
   symlink "../qemu-$target_name" "$target_dir/qemu-$target_name"
 else
   symlink "../qemu-system-$target_name" "$target_dir/qemu-system-$target_name"
 fi
-if test "$target_linux_user" = "yes" ; then
-  echo "CONFIG_LINUX_USER=y" >> $config_target_mak
-fi
 list=""
 if test ! -z "$gdb_xml_files" ; then
   for x in $gdb_xml_files; do
@@ -7643,9 +7636,6 @@
 if test "$target_user_only" = "yes" && test "$bflt" = "yes"; then
   echo "TARGET_HAS_BFLT=y" >> $config_target_mak
 fi
-if test "$target_bsd_user" = "yes" ; then
-  echo "CONFIG_BSD_USER=y" >> $config_target_mak
-fi
 
 done # for target in $targets
 
@@ -7655,6 +7645,7 @@
 if [ "$capstone" = "git" -o "$capstone" = "internal" ]; then
   subdirs="$subdirs capstone"
 fi
+echo "CONFIG_QEMU_INTERP_PREFIX=$interp_prefix" | sed 's/%M/@0@/' >> $config_host_mak
 echo "SUBDIRS=$subdirs" >> $config_host_mak
 if test -n "$LIBCAPSTONE"; then
   echo "LIBCAPSTONE=$LIBCAPSTONE" >> $config_host_mak