weston: update to 5.0.0

pmaport recreated on top of Alpine's current aport. The --pixman-type
patches were removed, it would have needed to be rewritten to work with
newer Weston source code. It is a Weston specific workaround for a
problem with the downstream kernels, so this is better fixed in the
kernel source code:
https://wiki.postmarketos.org/wiki/Troubleshooting:display#My_screen_is_red.21

The ABGR patch was rebased and submitted for upstreaming here:
https://gitlab.freedesktop.org/wayland/weston/merge_requests/61

Fixes #136.

temp/weston/weston-launch-custom-error-function.patch

@@ -0,0 +1,48 @@
+https://patchwork.freedesktop.org/patch/112884/
+
+error.h is a gnu extension and not available in other
+popular libcs like musl. This patch provides a replacement.
+
+Signed-off-by: Murray Calavera <murray.calavera@gmail.com>
+---
+ libweston/weston-launch.c | 20 +++++++++++++++++++-
+ 1 file changed, 19 insertions(+), 1 deletion(-)
+
+diff --git a/libweston/weston-launch.c b/libweston/weston-launch.c
+index 140fde1..84f7d60 100644
+--- a/libweston/weston-launch.c
++++ b/libweston/weston-launch.c
+@@ -33,7 +33,6 @@
+ #include <poll.h>
+ #include <errno.h>
+ 
+-#include <error.h>
+ #include <getopt.h>
+ 
+ #include <sys/types.h>
+@@ -112,6 +111,25 @@ struct weston_launch {
+ 
+ union cmsg_data { unsigned char b[4]; int fd; };
+ 
++static void
++error(int status, int errnum, const char *msg, ...)
++{
++	va_list args;
++
++	fputs("weston-launch: ", stderr);
++	va_start(args, msg);
++	vfprintf(stderr, msg, args);
++	va_end(args);
++
++	if (errnum)
++		fprintf(stderr, ": %s\n", strerror(errnum));
++	else
++		fputc('\n', stderr);
++
++	if (status)
++		exit(status);
++}
++
+ static gid_t *
+ read_groups(void)
+ {