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

src/cdrom/Makefile.am

@@ -3,7 +3,9 @@
 
 noinst_LTLIBRARIES = libcdrom.la
 
-ARCH_SUBDIRS = dummy beos freebsd linux macos openbsd qnx win32
+ARCH_SUBDIRS = $(srcdir)/dummy $(srcdir)/beos $(srcdir)/freebsd \
+	$(srcdir)/linux $(srcdir)/macos $(srcdir)/openbsd \
+	$(srcdir)/qnx $(srcdir)/win32
 
 # Include the architecture-independent sources
 COMMON_SRCS = SDL_cdrom.c SDL_syscdrom.h

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

src/thread/Makefile.am

@@ -3,7 +3,8 @@
 
 noinst_LTLIBRARIES = libthread.la
 
-ARCH_SUBDIRS = generic amigaos beos irix linux win32
+ARCH_SUBDIRS = $(srcdir)/generic $(srcdir)/amigaos $(srcdir)/beos \
+	$(srcdir)/irix $(srcdir)/linux $(srcdir)/win32
 
 # Older versions of Linux require an asm clone() implementation
 if USE_CLONE

src/timer/Makefile.am

@@ -3,7 +3,8 @@
 
 noinst_LTLIBRARIES = libtimer.la
 
-ARCH_SUBDIRS = amigaos beos linux macos win32
+ARCH_SUBDIRS = $(srcdir)/amigaos $(srcdir)/beos $(srcdir)/linux \
+	$(srcdir)/macos $(srcdir)/win32
 
 # Include the architecture-independent sources
 COMMON_SRCS = SDL_timer.c SDL_timer_c.h SDL_systimer.h