Bump from the 0.9-rc4 pre-release to 0.9-rc5. Update PKG_VERSION,
PKG_SOURCE, PKG_SOURCE_URL, PKG_BUILD_DIR and PKG_HASH accordingly.
The two carried patches (010-pkgconfig, 020-no-po-subdir) still apply
unchanged, and test-version.sh already normalises the underscore in the
apk version (0.9_rc5) back to the upstream 0.9-rc5 string.
Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>
(cherry picked from commit dc11dc66d2)