Disable Modula3 target language

Clean up to disable target languages that have been neglected/not functional.
Target language be fully deleted in SWIG 4.1 unless a new maintainer brings
it up to an acceptable status (experimental or supported).

Issue #1447

Makefile.in

@@ -72,7 +72,6 @@ skip-octave     = test -n "@SKIP_OCTAVE@"
 skip-pike       = test -n "@SKIP_PIKE@"
 skip-chicken	= test -n "@SKIP_CHICKEN@"
 skip-csharp	= test -n "@SKIP_CSHARP@"
-skip-modula3	= test -n "@SKIP_MODULA3@"
 skip-lua    	= test -n "@SKIP_LUA@"
 skip-allegrocl  = test -n "@SKIP_ALLEGROCL@"
 skip-clisp	= test -n "@SKIP_CLISP@"
@@ -120,7 +119,6 @@ check-aliveness:
 	@$(skip-pike)     || ./$(TARGET) -pike       -help
 	@$(skip-chicken)  || ./$(TARGET) -chicken    -help
 	@$(skip-csharp)   || ./$(TARGET) -csharp     -help
-	@$(skip-modula3)  || ./$(TARGET) -modula3    -help
 	@$(skip-allegrocl)|| ./$(TARGET) -allegrocl  -help
 	@$(skip-clisp)    || ./$(TARGET) -clisp      -help
 	@$(skip-uffi)     || ./$(TARGET) -uffi       -help
@@ -152,7 +150,6 @@ check-versions:					\
 	check-pike-version			\
 	check-chicken-version			\
 	check-csharp-version			\
-	check-modula3-version			\
 	check-lua-version			\
 	check-allegrocl-version			\
 	check-clisp-version			\
@@ -192,7 +189,6 @@ check-examples:					\
 	check-pike-examples			\
 	check-chicken-examples                  \
 	check-csharp-examples                   \
-	check-modula3-examples                  \
 	check-lua-examples			\
 	check-allegrocl-examples		\
 	check-clisp-examples			\
@@ -218,7 +214,6 @@ php_examples       :=$(shell sed '/^\#/d' $(srcdir)/Examples/php/check.list)
 pike_examples      :=$(shell sed '/^\#/d' $(srcdir)/Examples/pike/check.list)
 chicken_examples   :=$(shell sed '/^\#/d' $(srcdir)/Examples/chicken/check.list)
 csharp_examples    :=$(shell sed '/^\#/d' $(srcdir)/Examples/csharp/check.list)
-modula3_examples   :=$(shell sed '/^\#/d' $(srcdir)/Examples/modula3/check.list)
 lua_examples       :=$(shell sed '/^\#/d' $(srcdir)/Examples/lua/check.list)
 allegrocl_examples :=
 clisp_examples     :=
@@ -265,7 +260,6 @@ check-test-suite:				\
 	check-php-test-suite			\
 	check-pike-test-suite			\
 	check-csharp-test-suite			\
-	check-modula3-test-suite		\
 	check-lua-test-suite			\
 	check-allegrocl-test-suite		\
 	check-clisp-test-suite			\
@@ -319,7 +313,6 @@ all-test-suite:					\
 	all-php-test-suite			\
 	all-pike-test-suite			\
 	all-csharp-test-suite			\
-	all-modula3-test-suite			\
 	all-lua-test-suite			\
 	all-allegrocl-test-suite		\
 	all-clisp-test-suite			\
@@ -349,7 +342,6 @@ broken-test-suite:				\
 	broken-php-test-suite			\
 	broken-pike-test-suite			\
 	broken-csharp-test-suite		\
-	broken-modula3-test-suite		\
 	broken-lua-test-suite			\
 	broken-allegrocl-test-suite		\
 	broken-clisp-test-suite			\
@@ -492,7 +484,7 @@ install-main:
 	@$(INSTALL_PROGRAM) $(TARGET) $(DESTDIR)$(BIN_DIR)/`echo $(TARGET_NOEXE) | sed '$(transform)'`@EXEEXT@
 
 lib-languages = typemaps tcl perl5 python guile java mzscheme ruby php ocaml octave \
-	pike chicken csharp modula3 allegrocl clisp lua cffi uffi r go d javascript javascript/jsc \
+	pike chicken csharp allegrocl clisp lua cffi uffi r go d javascript javascript/jsc \
 	javascript/v8 scilab xml
 
 lib-modules = std