Revert "bzip2: extend/fix the Host/Install rule to install libbz2.so files"

Revert "bzip2: extend/fix the Host/Install rule to install libbz2.so files"

This reverts r47245.

Linking to shared libraries under $STAGING_DIR_HOST{,/usr}/lib is harmful,
as these directories aren't added to LD_LIBRARY_PATH (see r47103 for an
explanation why LD_LIBRARY_PATH is not used).

Revert to static linking; in particular, this fixes the build of the python
bz2 module on OpenSUSE and Fedora (which in turn broke the build of
nodejs).

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
Backport of r47950

git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@47951 3c298f89-4303-0410-b956-a3cf2f4a3e73