build: Drop meson version test for 0.48

With db8024d ("build: require meson 0.50.0+") we don't need to
test the meson version for the fall through compiler feature.

Signed-off-by: Daniel Wagner <[email protected]>

Author: dwsuse

meson.build

@@ -180,24 +180,7 @@ conf.set10(
     description: 'Is linux/mctp.h include-able?'
 )
 
-if meson.version().version_compare('>= 0.48')
-  has_fallthrough = cc.has_function_attribute('fallthrough')
-else
-  has_fallthrough = cc.compiles(
-    '''int main(int argc, char **argv) {
-           switch(argc) {
-               case 0:
-                   __attribute__((__fallthrough__));
-               case 1:
-                   return 1;
-           }
-           return 0;
-       }
-    ''',
-    name: 'has fallthrough')
-endif
-
-if has_fallthrough
+if cc.has_function_attribute('fallthrough')
   conf.set('fallthrough', '__attribute__((__fallthrough__))')
 else
   conf.set('fallthrough', 'do {} while (0) /* fallthrough */')