add support for $sbindir

Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>

data/macros.meson

@@ -12,6 +12,7 @@
         --libdir=%{_libdir}                 \\\
         --libexecdir=%{_libexecdir}         \\\
         --bindir=%{_bindir}                 \\\
+        --sbindir=%{_sbindir}               \\\
         --includedir=%{_includedir}         \\\
         --datadir=%{_datadir}               \\\
         --mandir=%{_mandir}                 \\\

mesonbuild/coredata.py

@@ -208,6 +208,7 @@ builtin_options = {
         'libdir'            : [ UserStringOption, 'Library directory.', default_libdir() ],
         'libexecdir'        : [ UserStringOption, 'Library executable directory.', default_libexecdir() ],
         'bindir'            : [ UserStringOption, 'Executable directory.', 'bin' ],
+        'sbindir'           : [ UserStringOption, 'System executable directory.', 'sbin' ],
         'includedir'        : [ UserStringOption, 'Header file directory.', 'include' ],
         'datadir'           : [ UserStringOption, 'Data file directory.', 'share' ],
         'mandir'            : [ UserStringOption, 'Manual page directory.', 'share/man' ],

mesonbuild/mconf.py

@@ -169,6 +169,7 @@ class Conf:
                     'libdir',
                     'libexecdir',
                     'bindir',
+                    'sbindir',
                     'includedir',
                     'datadir',
                     'mandir',

mesonbuild/mesonmain.py

@@ -41,6 +41,7 @@ add_builtin_argument('prefix')
 add_builtin_argument('libdir')
 add_builtin_argument('libexecdir')
 add_builtin_argument('bindir')
+add_builtin_argument('sbindir')
 add_builtin_argument('includedir')
 add_builtin_argument('datadir')
 add_builtin_argument('mandir')