php5-pecl-http: disable libevent support (fixes #13742)

When libevent2 was found in staging directory the configure scripts
automatically adds a dependency to it. This breaks the build as
mentioned in #13742.
To keep the footprint on the target small let's explicit disable
it rather than adding an dependency on libevent2.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

git-svn-id: svn://svn.openwrt.org/openwrt@37379 3c298f89-4303-0410-b956-a3cf2f4a3e73
php5-pecl-libevent: upgrade to 0.1.0

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

git-svn-id: svn://svn.openwrt.org/openwrt@37380 3c298f89-4303-0410-b956-a3cf2f4a3e73
php5-pecl-http: upgrade to 1.7.6

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

git-svn-id: svn://svn.openwrt.org/openwrt@37381 3c298f89-4303-0410-b956-a3cf2f4a3e73