Move maintainer line up for consistency between packages.

Remove CMAKE_INSTALL as there is an explicit InstallDev section.

Add PKG_BUILD_PARALLEL for faster compilation.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

As package curl has been imported from core and only libcurl depends on
nghttp2 import it as well from core repo

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>