(svn r3281) -Feature: [OSX] added native cocoa sound and video drivers (egladil)

you can still use SDL drivers if you like and you have to run "make upgradeconf" to start using the cocoa drivers (or manually write WITH_COCOA:=1)
	since SDL breaks the cocoa drivers, you can't compile with both SDL and cocoa support
	Using cocoa drivers makes it easier to make universal binaries and it solves:
	-FS#18 [OSX] SDL is weird in universal binaries
	-FS#2  [OSX] lazy pointer crash on exit
	-FS#10 [OSX] linking error when linking statically to SDL 1.2.8 (needless to explain this, but it means it should be able to compile statically with the default settings now)
	-[ 1215073 ] Switching to large size out of fullscreen crashes
	Using SDL drivers will still have those issues though

fileio.c

@@ -141,6 +141,37 @@ bool FiosCheckFileExists(const char *filename)
 	}
 }
 
+FILE *FioFOpenFile(const char *filename)
+{
+	FILE *f;
+	char buf[MAX_PATH];
+
+	sprintf(buf, "%s%s", _path.data_dir, filename);
+
+	f = fopen(buf, "rb");
+#if !defined(WIN32)
+	if (f == NULL) {
+		char *s;
+		// Make lower case and try again
+		for(s=buf + strlen(_path.data_dir) - 1; *s != 0; s++)
+			*s = tolower(*s);
+		f = fopen(buf, "rb");
+
+#if defined SECOND_DATA_DIR
+		// tries in the 2nd data directory
+		if (f == NULL) {
+			sprintf(buf, "%s%s", _path.second_data_dir, filename);
+			for(s=buf + strlen(_path.second_data_dir) - 1; *s != 0; s++)
+				*s = tolower(*s);
+			f = fopen(buf, "rb");
+		}
+#endif
+	}
+#endif
+
+	return f;
+}
+
 void FioOpenFile(int slot, const char *filename)
 {
 	FILE *f;