Remove concept of stable/unstable from build tools

We never practiced the concept of stable and unstable releases, let's
remove the code and always use the stable scheme.

configure.ac

@@ -46,16 +46,7 @@ AC_SUBST(HB_VERSION)
 # Libtool version
 m4_define([hb_version_int],
 	  m4_eval(hb_version_major*10000 + hb_version_minor*100 + hb_version_micro))
-m4_if(m4_eval(hb_version_minor % 2), [1],
-      dnl for unstable releases
-      [m4_define([hb_libtool_revision], 0)],
-      dnl for stable releases
-      [m4_define([hb_libtool_revision], hb_version_micro)])
-m4_define([hb_libtool_age],
-	  m4_eval(hb_version_int - hb_libtool_revision))
-m4_define([hb_libtool_current],
-	  m4_eval(hb_libtool_age))
-HB_LIBTOOL_VERSION_INFO=hb_libtool_current:hb_libtool_revision:hb_libtool_age
+HB_LIBTOOL_VERSION_INFO=hb_version_int:0:hb_version_int
 AC_SUBST(HB_LIBTOOL_VERSION_INFO)
 
 AC_ARG_WITH([libstdc++],

meson.build

@@ -12,14 +12,7 @@ hb_version_micro = hb_version_arr[2].to_int()
 
 # libtool versioning
 hb_version_int = hb_version_major*10000 + hb_version_minor*100 + hb_version_micro
-if hb_version_minor % 2 == 1
-  hb_libtool_revision = 0                # for unstable releases
-else
-  hb_libtool_revision = hb_version_micro # for stable releases
-endif
-hb_libtool_age = hb_version_int - hb_libtool_revision
-hb_libtool_current = hb_libtool_age
-hb_libtool_version_info = '@0@:@1@:@2@'.format(hb_libtool_current, hb_libtool_revision, hb_libtool_age)
+hb_libtool_version_info = '@0@:0:@0@'.format(hb_version_int)
 
 pkgmod = import('pkgconfig')
 cpp = meson.get_compiler('cpp')

src/meson.build

@@ -379,7 +379,7 @@ harfbuzz_def = custom_target('harfbuzz.def',
     output: 'harfbuzz.def')
 defs_list = [harfbuzz_def]
 
-version = '0.' + '0'.join(meson.project_version().split('.')) + '.0'
+version = '0.@0@.0'.format(hb_version_int)
 
 extra_hb_cpp_args = []
 if cpp.get_id() == 'msvc'