FileAttributesPlugin: restructure platform support files

Restructure FileAttributesPlugin to move platform specific functionality
out to separate files.  This is required as Windows requires the "wide"
versions of posix functions to be used, e.g. access() vs.  _waccess(),
while other seem to require the Windows native functions, e.g.  iterating
over directories, and interleaving #ifdef _WIN32 was becoming unwieldy.

platforms/Cross/plugins/FileAttributesPlugin/faCommon.c

@@ -0,0 +1,36 @@
+/*
+ * faCommon.c
+ *
+ * Provides a number of platform independent functions.
+ */
+
+#include "sq.h"
+#include "faSupport.h"
+
+extern struct VirtualMachine * interpreterProxy;
+
+
+sqInt faSetStDirOop(fapath *aFaPath, sqInt pathNameOop)
+{
+int		len;
+char	*pathName;
+
+
+	len = interpreterProxy->stSizeOf(pathNameOop);
+	pathName = interpreterProxy->arrayValueOf(pathNameOop);
+	return faSetStDir(aFaPath, pathName, len);
+}
+
+
+
+sqInt faSetStPathOop(fapath *aFaPath, sqInt pathNameOop)
+{
+int		len;
+char	*pathName;
+
+
+	len = interpreterProxy->stSizeOf(pathNameOop);
+	pathName = interpreterProxy->arrayValueOf(pathNameOop);
+	return faSetStPath(aFaPath, pathName, len);
+}
+

platforms/Cross/plugins/FileAttributesPlugin/faPlugin.h

@@ -0,0 +1,10 @@
+/*
+ * faPlugin.h
+ *
+ * Declarations of routines generated by the plugin and used by the platform 
+ * support routines.
+ */
+
+
+sqInt byteArrayFromCStringto(const char *aCString, sqInt *byteArrayOop);
+