meson: also indent scripts with 8 spaces

src/basic/errno-to-name.awk

@@ -1,4 +1,9 @@
-BEGIN{ print "static const char* const errno_names[] = { " }
+BEGIN{
+        print "static const char* const errno_names[] = { "
+}
 !/EDEADLOCK/ && !/EWOULDBLOCK/ && !/ENOTSUP/ {
-    printf "        [%s] = \"%s\",\n", $1, $1 }
-END{ print "};" }
+        printf "        [%s] = \"%s\",\n", $1, $1
+}
+END{
+        print "};"
+}