Drop the deprecated lm32 target

Target lm32 was deprecated in commit d849800512, v5.2.0.  See there
for rationale.

Some of its code lives on in device models derived from milkymist
ones: hw/char/digic-uart.c and hw/display/bcm2835_fb.c.

Cc: Michael Walle <michael@walle.cc>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210503084034.3804963-2-armbru@redhat.com>
Acked-by: Michael Walle <michael@walle.cc>
[Trivial conflicts resolved, reST markup fixed]

configure

@@ -1663,7 +1663,7 @@ if [ "$ARCH" = "unknown" ]; then
 fi
 
 default_target_list=""
-deprecated_targets_list=ppc64abi32-linux-user,lm32-softmmu,unicore32-softmmu
+deprecated_targets_list=ppc64abi32-linux-user,unicore32-softmmu
 deprecated_features=""
 mak_wilds=""
 
@@ -3617,7 +3617,7 @@ case "$fdt" in
 esac
 
 ##########################################
-# opengl probe (for sdl2, gtk, milkymist-tmu2)
+# opengl probe (for sdl2, gtk)
 
 gbm="no"
 if $pkg_config gbm; then
@@ -6274,14 +6274,13 @@ fi
 # UNLINK is used to remove symlinks from older development versions
 # that might get into the way when doing "git update" without doing
 # a "make distclean" in between.
-DIRS="tests tests/tcg tests/tcg/lm32 tests/qapi-schema tests/qtest/libqos"
+DIRS="tests tests/tcg tests/qapi-schema tests/qtest/libqos"
 DIRS="$DIRS tests/qtest tests/qemu-iotests tests/vm tests/fp tests/qgraph"
 DIRS="$DIRS docs docs/interop fsdev scsi"
 DIRS="$DIRS pc-bios/optionrom pc-bios/s390-ccw"
 DIRS="$DIRS roms/seabios"
 DIRS="$DIRS contrib/plugins/"
 LINKS="Makefile"
-LINKS="$LINKS tests/tcg/lm32/Makefile"
 LINKS="$LINKS tests/tcg/Makefile.target"
 LINKS="$LINKS pc-bios/optionrom/Makefile"
 LINKS="$LINKS pc-bios/s390-ccw/Makefile"