Reorganized Makefile for consistency between packages.

Removed InstallDev section. It is already implied by CMAKE_INSTALL

Added PKG_BUILD_PARALLEL for faster compilation.

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

This change is inspired by commit openwrt/openwrt@38b22b1e ("nghttp2:
deduplicate files in libnghttp2")

The packages in this commit are identified with the following command

	grep -rin -E 'INSTALL_(DATA|BIN)' | grep -F '.so' | grep -F '*'

Some of them do not have symlinks and are not affected, but the change
is still applied for consideration of best practices just in case

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

It's not even used.

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

PR includes switch to codeload tarballs.

Signed-off-by: Mislav Novakovic <mislav.novakovic@sartura.hr>

Signed-off-by: Matija Amidzic <matija.amidzic@sartura.hr>

Signed-off-by: Mislav Novakovic <mislav.novakovic@sartura.hr>

Signed-off-by: Mislav Novakovic <mislav.novakovic@sartura.hr>

Patch includes updates to packages:
netopeer2: update to version 0.4.0
sysrepo: update to 0.7.0
libnetconf2: update to 0.9.15
libyang: update to 0.13.46

Signed-off-by: Mislav Novakovic <mislav.novakovic@sartura.hr>

Signed-off-by: Antonio Paunovic <antonio.paunovic@sartura.hr>

Signed-off-by: Mislav Novakovic <mislav.novakovic@sartura.hr>

Signed-off-by: Mislav Novakovic <mislav.novakovic@sartura.hr>