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
diff --git a/src/os_amiga.c b/src/os_amiga.c
index e2b1579..0b63ea1 100644
--- a/src/os_amiga.c
+++ b/src/os_amiga.c
@@ -22,6 +22,9 @@
 #undef TRUE		/* will be redefined by exec/types.h */
 #undef FALSE
 
+/* cproto fails on missing include files, skip them */
+#ifndef PROTO
+
 #ifndef LATTICE
 # include <exec/types.h>
 # include <exec/exec.h>
@@ -55,6 +58,8 @@
 # include <libraries/arp_pragmas.h>
 #endif
 
+#endif /* PROTO */
+
 /*
  * At this point TRUE and FALSE are defined as 1L and 0L, but we want 1 and 0.
  */
@@ -283,7 +288,9 @@
 #endif
 }
 
-#include <workbench/startup.h>
+#ifndef PROTO
+# include <workbench/startup.h>
+#endif
 
 /*
  * Check_win checks whether we have an interactive window.
@@ -1002,7 +1009,9 @@
  * Heavely modified by mool.
  */
 
-#include <devices/conunit.h>
+#ifndef PROTO
+# include <devices/conunit.h>
+#endif
 
 /*
  * try to get the real window size
@@ -1129,9 +1138,11 @@
  * say 'oml lib:amiga.lib -r sendpacket.o'
  */
 
+#ifndef PROTO
 /* #include <proto/exec.h> */
 /* #include <proto/dos.h> */
-#include <exec/memory.h>
+# include <exec/memory.h>
+#endif
 
 /*
  * Function - dos_packet written by Phil Lindsay, Carolyn Scheppner, and Andy