Remove support for AmigaOS

There is a lot of specialized code for supporting AmigaOS and it has
not been maintained for a number of years.  It's highly unlikely that
the latest versions even compile properly on AmigaOS anymore.  After
requesting that someone step forward to own the maintenance of the
port in the GNU Make 4.4 release and getting no takers, I removed it.

* NEWS: Announce the removal.
* README.in: Remove README.Amiga reference.
* README.Amiga: Remove unused file.
* SCOPTIONS: Ditto.
* src/amiga.c: Ditto.
* src/amiga.h: Ditto.
* src/config.ami: Ditto.
* mk/Amiga.mk: Ditto.
* Makefile.am: Remove references to deleted files.
* Basic.mk.template: Ditto.
* maintMakefile: Ditto.
* src/commands.c: Remove ifdef'd Amiga code.
* src/default.c: Ditto.
* src/dir.c: Ditto.
* src/file.c: Ditto.
* src/function.c: Ditto.
* src/job.c: Ditto.
* src/job.h: Ditto.
* src/main.c: Ditto.
* src/os.h: Ditto.
* src/read.c: Ditto.
* src/remake.c: Ditto.

1 files changed, 0 insertions, 16 deletions

diff --git a/src/dir.c b/src/dir.c
index 3e94b98e..9c5fa0a9 100644
--- a/src/dir.c
+++ b/src/dir.c
@@ -114,10 +114,6 @@ dosify (const char *filename)
 #include "pathstuff.h"
 #endif
 
-#ifdef _AMIGA
-#include <ctype.h>
-#endif
-
 #ifdef HAVE_CASE_INSENSITIVE_FS
 static const char *
 downcase (const char *filename)
@@ -853,11 +849,7 @@ file_exists_p (const char *name)
   }
 #endif /* HAVE_DOS_PATHS */
   if (dirend == NULL)
-#ifndef _AMIGA
     return dir_file_exists_p (".", name);
-#else /* !AMIGA */
-    return dir_file_exists_p ("", name);
-#endif /* AMIGA */
 
   slash = dirend;
   if (dirend == name)
@@ -927,11 +919,7 @@ file_impossible (const char *filename)
   }
 #endif /* HAVE_DOS_PATHS */
   if (dirend == NULL)
-#ifdef _AMIGA
-    dir = find_directory ("");
-#else /* !AMIGA */
     dir = find_directory (".");
-#endif /* AMIGA */
   else
     {
       const char *dirname;
@@ -1023,11 +1011,7 @@ file_impossible_p (const char *filename)
   }
 #endif /* HAVE_DOS_PATHS */
   if (dirend == NULL)
-#ifdef _AMIGA
-    dir = find_directory ("")->contents;
-#else /* !AMIGA */
     dir = find_directory (".")->contents;
-#endif /* AMIGA */
   else
     {
       const char *dirname;