updated for version 7.3.719

Problem:    Cannot run new version of cproto, it fails on missing include
            files.
Solution:   Add lots of #ifndef PROTO

src/os_amiga.h

@@ -56,6 +56,9 @@
 # define TEMPNAMELEN	12
 #endif
 
+/* cproto fails on missing include files */
+#ifndef PROTO
+
 #include <exec/types.h>
 #include <libraries/dos.h>
 #include <libraries/dosextens.h>
@@ -67,6 +70,8 @@
 # include <proto/intuition.h>
 #endif
 
+#endif /* PROTO */
+
 #define FNAME_ILLEGAL ";*?`#%" /* illegal characters in a file name */
 
 /*
@@ -85,6 +90,7 @@ typedef long off_t;
 # include <unistd.h>
 #endif
 
+#ifndef PROTO
 /*
  * arpbase.h must be included before functions.h
  */
@@ -92,6 +98,8 @@ typedef long off_t;
 # include <libraries/arpbase.h>
 #endif
 
+#endif /* PROTO */
+
 /*
  * This won't be needed if you have a version of Lattice 4.01 without broken
  * break signal handling.