Applied Paul Jenner's patches to fix "make distcheck" and "make rpm"

src/main/Makefile.am

@@ -4,7 +4,8 @@
 # This is necessary because some platforms have special program
 # entry points, which require special application initialization.
 
-ARCH_SUBDIRS = beos linux macos win32
+ARCH_SUBDIRS = $(srcdir)/beos $(srcdir)/linux $(srcdir)/macos \
+	$(srcdir)/win32
 
 # Build a separate library containing the main() entry point.
 lib_LIBRARIES = libSDLmain.a