debian/rules: Highly enforce --no-parallel mode while Xserver is still on imake. Can be re-parallelized after autotools conversion.

Revert "debian/rules: Avoid dh_auto_build. It adds -Oline since 11.2 which let's make choke in nx-X11/ subdir on the Makefiles target. Reason unknown."

This reverts commit 94d77e27.

This reverts commit 190e3df4.

debian/rules: Drop override_dh_clean. Makefile (et al.) removal in nx-X11/ has now been moved to the distclean target.

debian/rules: Avoid dh_auto_build. It adds -Oline since 11.2 which let's make choke in nx-X11/ subdir on the Makefiles target. Reason unknown.

debian/rules: Fix FTCBFS: (see Debian bug #875867) Fix build/host confusion in debian/rules. Pass --host to ./configure.

As discussed in ArcticaProject/nx-libs#610, we need a way to load
libNX_X11 as a fake version of libX11 into nxagent's address space.

For doing so, we have to link against libX11 at build-time and specify
a(n) RPATH/RUNPATH to our libX11 -> libNX_X11 compat symlinks.

This commit is essentially doing a cross between options 3 and 4
discussed in the provided GH issue.

We link libX11 early (before specifying -Lcompat_symlinks_dir), so that
the linker finds the "real" libX11 version with the libX11 SONAME. This
leads to our binary depending upon both libX11 and libNX_X11 SONAMEs. We
already always added RPATH/RUNPATH, but these values are not passed down
to dependent libraries.

What happens at run-time is that the loader searches for a libX11
SONAME, takes RPATH/RUNPATH into account and loads our libNX_X11 library
instead via the compat symlinks. This satisfies the libX11 SONAME and
dependent libraries will *not* load the system libX11 version again.

Debian's dpkg-shlibdeps isn't quite happy about this mismatching SONAME
situation, so instruct to look the other way while we're minding our
business.

Fixes: ArcticaProject/nx-libs#610

Backported from Arctica GH 3.6.x branch.

v2: backport to nx-libs 3.5.0.x (Mihai Moldovan)

Adds:
  - debian/patches/1500_all_propagate-optflags-to-subcompone.full+lite.patch

debian/rules: Drop override_dh_clean target. Not required anymore, as configure files get removed correctly now.

 This also solves the last remnant of overlinking as described in GH issue #133.

 Fixes ArcticaProject/nx-libs#133.

debian/{rules,nx-x11proto-xext-dev}: More Xext header files belong int nx-x11proto-xext-dev (instead of removing them in debian/rules).

debian/rules: Don't manually override SHLIBDIR via the dh_auto_build call. The default in the main Makefile should work fine.

debian/rules: Don't manually override SHLIBDIR via the dh_auto_build call. The default in the main Makefile should work fine.

 Fixes ArcticaProject/nx-libs#276.

debian/rules: Don't use -pie -fPIE at build time for 3.5.99.2 as it causes nxagent to segfault. Investigating the reasons behind it is in process...

debian/rules: Don't modify/create post{inst,rm} scripts during dh_makeshlibs. This avoids adding ldconfig calls to such scripts.