[ci skip] Fix typo in configure.ac (build → built)

Closes GH-9495.

Author: dwxh

configure.ac

@@ -1052,7 +1052,7 @@ PHP_HELP_SEPARATOR([Extensions:
 
   --with-EXTENSION=[shared[,PATH]]
 
-    NOTE: Not all extensions can be build as 'shared'.
+    NOTE: Not all extensions can be built as 'shared'.
 
     Example: --with-foobar=shared,/usr/local/foobar/