Fixed Changelog

rpm: include shared library and pkg-config file

autotools: check for expat.h if pkg-config failed

Some distros provides libexpat without expat.pc. So PKG_CHECK_MODULES
fails even if libexpat is installed. To fix this AC_CHECK_HEADER added
back.

Merge pull request strophe#27 from cicku/patch-1

Correct the libtool file