Drop support for discontinued DGUX

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>

acinclude.m4

@@ -7012,15 +7012,6 @@ darwin* | rhapsody*)
   sys_lib_dlsearch_path_spec='/usr/local/lib /lib /usr/lib'
   ;;
 
-dgux*)
-  version_type=linux
-  need_lib_prefix=no
-  need_version=no
-  library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname$shared_ext'
-  soname_spec='${libname}${release}${shared_ext}$major'
-  shlibpath_var=LD_LIBRARY_PATH
-  ;;
-
 freebsd1*)
   dynamic_linker=no
   ;;
@@ -8643,24 +8634,6 @@ case $host_os in
     _LT_AC_TAGVAR(ld_shlibs, $1)=no
   fi
     ;;
-
-  dgux*)
-    case $cc_basename in
-      ec++)
-	# FIXME: insert proper C++ library support
-	_LT_AC_TAGVAR(ld_shlibs, $1)=no
-	;;
-      ghcx)
-	# Green Hills C++ Compiler
-	# FIXME: insert proper C++ library support
-	_LT_AC_TAGVAR(ld_shlibs, $1)=no
-	;;
-      *)
-	# FIXME: insert proper C++ library support
-	_LT_AC_TAGVAR(ld_shlibs, $1)=no
-	;;
-    esac
-    ;;
   freebsd[12]*)
     # C++ shared libraries reported to be fairly broken before switch to ELF
     _LT_AC_TAGVAR(ld_shlibs, $1)=no
@@ -10175,19 +10148,6 @@ AC_MSG_CHECKING([for $compiler option to produce PIC])
 	  ;;
 	esac
 	;;
-      dgux*)
-	case $cc_basename in
-	  ec++)
-	    _LT_AC_TAGVAR(lt_prog_compiler_pic, $1)='-KPIC'
-	    ;;
-	  ghcx)
-	    # Green Hills C++ Compiler
-	    _LT_AC_TAGVAR(lt_prog_compiler_pic, $1)='-pic'
-	    ;;
-	  *)
-	    ;;
-	esac
-	;;
       freebsd* | kfreebsd*-gnu)
 	# FreeBSD uses GNU C++
 	;;
@@ -10936,12 +10896,6 @@ EOF
     fi  
       ;;
 
-    dgux*)
-      _LT_AC_TAGVAR(archive_cmds, $1)='$LD -G -h $soname -o $lib $libobjs $deplibs $linker_flags'
-      _LT_AC_TAGVAR(hardcode_libdir_flag_spec, $1)='-L$libdir'
-      _LT_AC_TAGVAR(hardcode_shlibpath_var, $1)=no
-      ;;
-
     freebsd1*)
       _LT_AC_TAGVAR(ld_shlibs, $1)=no
       ;;