deb: disable running tests on build

`Packpack` performs building rpm packages in a clean docker container.
The container must contain `luatest` to perform testing during the
build as it was set by `-DEB_MAKE_CHECK_TARGET := luatest` variable.

It's quite challenging to set up `luacheck` while the package is
building and a bit useless because the module is tested in another job.

This commit removes testing http module during the build by `packpack`.

debian/rules

@@ -2,7 +2,6 @@
 
 DEB_CMAKE_EXTRA_FLAGS := -DCMAKE_INSTALL_LIBDIR=lib/$(DEB_HOST_MULTIARCH) \
 			-DCMAKE_BUILD_TYPE=RelWithDebInfo
-DEB_MAKE_CHECK_TARGET := luatest
 
 include /usr/share/cdbs/1/rules/debhelper.mk
 include /usr/share/cdbs/1/class/cmake.mk