Modify Autotools scripts

Modify Autotools scripts to output shared library.

src/Makefile.am

@@ -1,14 +1,16 @@
 # Makefile for primary source directory.
-SUBDIRS = extra # Subdirectory for GUI.
-bin_PROGRAMS = $(top_builddir)/bin/rtr # Program name.
-__top_builddir__bin_rtr_CFLAGS = -DBUILD # Define BUILD preprocessor variable.
-__top_builddir__bin_rtr_SOURCES = main.c # Sources
-
-if extra
-__top_builddir__bin_rtr_LDADD = ./extra/libextra.la # Include extra.
+#SUBDIRS = extra # Subdirectory for GUI.
+#bin_PROGRAMS = $(top_builddir)/bin/rtr # Program name.
+#__top_builddir__bin_rtr_CFLAGS = -DBUILD # Define BUILD variable.
+#__top_builddir__bin_rtr_SOURCES = main.c # Sources
+bin_PROGRAMS = rtr
+rtr_CFLAGS = -DBUILD -c -fPIC # Define BUILD variable.
+rtr_SOURCES = main.c # Sources
+#if extra
+#__top_builddir__bin_rtr_LDADD = ./extra/libextra.la # Include extra.
 
 # -Bshared sets preference for shared libraries.
 # No libraries are currently linked here.
-AM_CFLAGS = "-I$(srcdir) \
-			-Bshared
-endif
+#AM_CFLAGS = "-I$(srcdir) \
+#			-Bshared
+#endif

src/main.c

@@ -5,3 +5,16 @@
  */
 
 #include "main.h"
+#include <stdio.h>
+
+/* This file is included in the repository since using a Git submodule would
+ * requried cloning the entire Godot source. */
+#include "gdextension_interface.h" /* GDExtension header for Godot. */
+
+/*
+int main()
+{
+    printf("Starting./n");
+    return(0);
+}
+*/