configure: remove dead code

tcg_interpreter is never written, it is purely a meson option;
trace_backends is never read.

And SeaBIOS is only build from the source tree with roms/Makefile,
so the config.mak file is unused.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -320,7 +320,6 @@ linux_user=""
 bsd_user=""
 pkgversion=""
 pie=""
-trace_backends="log"
 trace_file="trace"
 opengl="$default_feature"
 coroutine=""
@@ -391,7 +390,6 @@ for opt do
                       cross_cc_vars="$cross_cc_vars cross_cc_cflags_${cc_arch}"
   ;;
   --cross-cc-*) cc_arch=${opt#--cross-cc-}; cc_arch=${cc_arch%%=*}
-                cc_archs="$cc_archs $cc_arch"
                 eval "cross_cc_${cc_arch}=\$optarg"
                 cross_cc_vars="$cross_cc_vars cross_cc_${cc_arch}"
   ;;
@@ -2881,9 +2879,6 @@ fi
 if test "$vhost_user_fs" = "yes" ; then
   echo "CONFIG_VHOST_USER_FS=y" >> $config_host_mak
 fi
-if test "$tcg" = "enabled" -a "$tcg_interpreter" = "true" ; then
-  echo "CONFIG_TCG_INTERPRETER=y" >> $config_host_mak
-fi
 
 if test "$opengl" = "yes" ; then
   echo "CONFIG_OPENGL=y" >> $config_host_mak
@@ -3024,7 +3019,6 @@ LINKS="Makefile"
 LINKS="$LINKS tests/tcg/Makefile.target"
 LINKS="$LINKS pc-bios/optionrom/Makefile"
 LINKS="$LINKS pc-bios/s390-ccw/Makefile"
-LINKS="$LINKS roms/seabios/Makefile"
 LINKS="$LINKS pc-bios/qemu-icon.bmp"
 LINKS="$LINKS .gdbinit scripts" # scripts needed by relative path in .gdbinit
 LINKS="$LINKS tests/avocado tests/data"
@@ -3059,24 +3053,6 @@ done
 export target_list source_path use_containers cpu host_cc
 $source_path/tests/tcg/configure.sh)
 
-# temporary config to build submodules
-if test -f $source_path/roms/seabios/Makefile; then
-  for rom in seabios; do
-    config_mak=roms/$rom/config.mak
-    echo "# Automatically generated by configure - do not modify" > $config_mak
-    echo "SRC_PATH=$source_path/roms/$rom" >> $config_mak
-    echo "AS=$as" >> $config_mak
-    echo "CCAS=$ccas" >> $config_mak
-    echo "CC=$cc" >> $config_mak
-    echo "BCC=bcc" >> $config_mak
-    echo "CPP=$cpp" >> $config_mak
-    echo "OBJCOPY=objcopy" >> $config_mak
-    echo "IASL=$iasl" >> $config_mak
-    echo "LD=$ld" >> $config_mak
-    echo "RANLIB=$ranlib" >> $config_mak
-  done
-fi
-
 config_mak=pc-bios/optionrom/config.mak
 echo "# Automatically generated by configure - do not modify" > $config_mak
 echo "TOPSRC_DIR=$source_path" >> $config_mak