libweston: bump major to 6

At least the following commits break the libweston ABI, strictly speaking:
- a5630eaf
- ce62cb3d
- 195dadeb
- c18ffd39
- ea54c2fd
- 27d7c395
- acff29b3
- 67629674
- c9c24773
- 65e1be12

Furhtermore, 64fbd0f4 break the weston
executable exported ABI.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

configure.ac

@@ -3,9 +3,9 @@ m4_define([weston_minor_version], [0])
 m4_define([weston_micro_version], [90])
 m4_define([weston_version],
           [weston_major_version.weston_minor_version.weston_micro_version])
-m4_define([libweston_major_version], [5])
+m4_define([libweston_major_version], [6])
 m4_define([libweston_minor_version], [0])
-m4_define([libweston_patch_version], [90])
+m4_define([libweston_patch_version], [0])
 
 AC_PREREQ([2.64])
 AC_INIT([weston],

meson.build

@@ -10,7 +10,7 @@ project('weston',
 	license: 'MIT/Expat',
 )
 
-libweston_major = 5
+libweston_major = 6
 
 # libweston_revision is manufactured to follow the autotools build's
 # library file naming, thanks to libtool