subversion: ensure --disable-debug doesn't mangle CFLAGS

Fixes:
http://autobuild.buildroot.net/results/fc6/fc69a19c66462585449f7c4dad174d45a84e4947/
http://autobuild.buildroot.net/results/e04/e0471f2a9087d547840a7b18863289963e357b57/
http://autobuild.buildroot.net/results/bd8/bd8cdf976937c7b9029658871929f4be464b7a47/
http://autobuild.buildroot.net/results/652/652c3afe844e912061fbc5991e6fecad98ff6e6f/

And many more.

When --disable-debug is passed to configure, as is automatically done by the
autotools infrastructure since 822a757456e (infra: Move
--enable/--disable-debug to package/Makefile.in), the configure script will
try to strip debugging (-g) options from the C/CXXFLAGS. The logic to do so
is unfortunately buggy, so it ends up mangling options like
-mfloat-gprs=double that we use on certain PowerPC variants, breaking the
build.

Fix it by adjusting the sed regexp to be more selective in what it strips.
The package unfortunately doesn't cleanly autoreconf, so configure is
patched instead of configure.ac.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
add readme.md
makefile: update version string
update .gitignore
skeleton: remove symlinks from /var/log and /var/spool
skeleton: add sysctl.conf
skeleton: add init.d helper script
skeleton: add module loading sysv script
skeleton: add rtc sysv script
skeleton: add netwait script
skeleton: add ntpd sysv script
skeleton: add cron sysv script
skeleton: update inittab file
skeleton: update profile script to use color prompts
skeleton: update s20urandom sysv script
skeleton: update s40network sysv script
skeleton: update rcs and rck scripts
board/ryco: add mksdcard script
board/ryco: add busybox.config
board/ryco: add raspberry pi kernel patch and config