libxml2 2.9.0
Shrink DependencyCollector#parse_symbol_spec and add tests
Add :libltdl dep for libtool's libltdl

The :libtool dep is implicitly a build-time dep; :libltdl can be used
for software that uses the ltdl library at runtime.
imagemagick: depends on libltdl

Fixes #17732.
py2cairo: depends on pkg-config
berkeley-db: add --enable-sql option

Closes #15166.
CurlDownloadStrategy: remove pointless type introspection
kill dead code
Don't reinvent IndexError here
gtk+ 2.24.15
at-spi2-atk: fix patch
liblinear 1.93

Closes #17760.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
scheme48 1.9

Closes #17757.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
openssl 1.0.1e
cairo 1.12.14
Catch JSON decoding errors in Apache download strategy

c.f. #17772.
solfege uses pkg-config

Closes #17775.
lighttpd: optional dep on libev
lighttpd: enable some free options
libev and libevent conflict