Add ability to add custom packages

Since drm-kmod is never going to match 12.2, we should just fix this now.

Any line starting with https in the package files is pulled separately.
They should be in reverse order of dependencies.

I've build drm-kmod for 12.2, but of course these could come from anywhere.

build.sh

@@ -183,9 +183,12 @@ packages()
   mount_nullfs ${packages} ${uzip}/var/cache/pkg
   mount -t devfs devfs ${uzip}/dev
   # FIXME: In the following line, the hardcoded "i386" needs to be replaced by "${arch}" - how?
-  cat "${cwd}/settings/packages.common-${MAJOR}" | sed '/^#/d' | sed '/\!i386/d' | xargs /usr/local/sbin/pkg-static -c "${uzip}" install -y
-  cat "${cwd}/settings/packages.${desktop}" | sed '/^#/d' | sed '/\!i386/d' | xargs /usr/local/sbin/pkg-static -c "${uzip}" install -y
-
+  for p in common-${MAJOR} ${desktop}; do
+    sed '/^#/d;/\!i386/d;/^https/d' "${cwd}/settings/packages.$p" | \
+      xargs /usr/local/sbin/pkg-static -c "${uzip}" install -y
+    sed -ne "/^https/s/%%ARCH%%/${arch}/p" "${cwd}/settings/packages.$p" | \
+      xargs /usr/local/sbin/pkg-static -c "${uzip}" add
+  done
   # Install the packages we have generated in pkg() that are listed in transient-packages-list
   ls -lh "${packages}/transient/"
   while read -r p; do
@@ -196,12 +199,6 @@ packages()
     /usr/local/sbin/pkg-static -r ${uzip} add "${packages}/transient/${p}" # pkg-static add has no -y
   done <"${packages}/transient/transient-packages-list"
 
-  # Workaround for kernel-related packages being broken in the default package repository
-  # as long as the previous dot release is still supported; FIXME
-  # https://forums.freebsd.org/threads/i915kms-package-breaks-on-12-2-release-workaround-build-from-ports.77501/
-  # FIXME: Add https://darkness-pi.monwarez.ovh/posts/synth-repository/ properly. How?
-  # IGNORE_OSVERSION=yes /usr/local/sbin/pkg-static -c "${uzip}" add https://darkness-pi.monwarez.ovh/amd64/All/drm-fbsd12.0-kmod-4.16.g20200221.txz
-  # For now we are just going back to using 12.1 rather than 12.2
   /usr/local/sbin/pkg-static -c ${uzip} info > "${cdroot}/data/system.uzip.manifest"
   cp "${cdroot}/data/system.uzip.manifest" "${isopath}.manifest"
   rm ${uzip}/etc/resolv.conf

settings/packages.common-12

@@ -10,14 +10,12 @@ xf86-input-mouse
 xf86-input-vmmouse
 xf86-video-ati
 xf86-video-cirrus
+xf86-video-intel
 xf86-video-scfb
 xf86-video-vesa
 xf86-video-vmware
 xf86-video-qxl # !i386
-drm-kmod
-drm-legacy-kmod
 libva-intel-driver
-drm-kmod
 # nvidia-driver # !i386 # Is now handled in build.sh initgfx()
 mesa-libs
 mesa-dri
@@ -60,3 +58,6 @@ b43-fwcutter
 dsbdriverd
 # Control screen brightness on some Intel-based machines including MacBook Pro
 intel-backlight
+https://www.bayofrum.net/~crees/pkg/hello-12.2%%ARCH%%-drm/gpu-firmware-kmod-g20201213.txz
+https://www.bayofrum.net/~crees/pkg/hello-12.2%%ARCH%%-drm/drm-fbsd12.0-kmod-4.16.g20201016_1.txz
+https://www.bayofrum.net/~crees/pkg/hello-12.2%%ARCH%%-drm/drm-kmod-g20190710_1.txz