feat: CLI-only version (without GTK)

Modify the build system and the source
files to support building a CLI-only
version with only glib2 as a dependency.
Use CLI_ONLY=1 ./configure, then make clean all.

rs03-includes.h

@@ -23,6 +23,7 @@
 #ifndef RS03INCLUDES_H
 #define RS03INCLUDES_H
 
+#ifndef CLI
 /* Data structs from rs03-window.c */
 
 typedef struct
@@ -117,6 +118,7 @@ typedef struct
    int    dataBytes;
    int    percent, lastPercent;
 } RS03Widgets;
+#endif
 
 /*
  * local working closure for internal checksums
@@ -131,6 +133,7 @@ typedef struct
  * These are exported via the Method struct 
  */
 
+#ifndef CLI
 void CreateRS03EncWindow(Method*, GtkWidget*);
 void CreateRS03FixWindow(Method*, GtkWidget*);
 void CreateRS03PrefsPage(Method*, GtkWidget*);
@@ -141,6 +144,7 @@ void ReadRS03Preferences(Method*);
 
 void ResetRS03VerifyWindow(Method*);
 void CreateRS03VerifyWindow(Method*, GtkWidget*);
+#endif
 
 /*
  * These are exported (resp. only used) in ecc-rs03.c and rs03*.c
@@ -196,11 +200,13 @@ void RS03Fix(Image*);
 int  RS03RecognizeFile(LargeFile*, EccHeader**);
 int  RS03RecognizeImage(Image*);
 
+#ifndef CLI
 /* rs03-window.c */
 
 void RS03AddFixValues(RS03Widgets*, int, int);
 void RS03SetFixMaxValues(RS03Widgets*, int, int, gint64);
 void RS03UpdateFixResults(RS03Widgets*, gint64, gint64);
+#endif
 
 /* rs03-verify.c */
 
@@ -211,7 +217,9 @@ void RS03Verify(Image*);
 /* temporary single threaded versions */
 
 void RS03SCreate(void);
+#ifndef CLI
 void CreateRS03SEncWindow(Method*, GtkWidget*);
 void ResetRS03SEncWindow(Method*);
+#endif
 
 #endif