Drop the stdint size tests that we never use anywhere

These were probably cribbed from libogg, but we don't use them here,
opus_types.h instead has a list of hardcoded arch definitions.

configure.ac

@@ -262,40 +262,6 @@ AC_CHECK_FUNCS([lrintf])
 AC_CHECK_FUNCS([lrint])
 AC_CHECK_FUNCS([__malloc_hook])
 
-AC_CHECK_SIZEOF(short)
-AC_CHECK_SIZEOF(int)
-AC_CHECK_SIZEOF(long)
-AC_CHECK_SIZEOF(long long)
-
-if test x$has_char16 = "xyes" ; then
-        case 1 in
-                $ac_cv_sizeof_short) SIZE16="short";;
-                $ac_cv_sizeof_int) SIZE16="int";;
-        esac
-else
-        case 2 in
-                $ac_cv_sizeof_short) SIZE16="short";;
-                $ac_cv_sizeof_int) SIZE16="int";;
-        esac
-fi
-
-if test x$has_char16 = "xyes" ; then
-        case 2 in
-                $ac_cv_sizeof_int) SIZE32="int";;
-                $ac_cv_sizeof_long) SIZE32="long";;
-                $ac_cv_sizeof_short) SIZE32="short";;
-        esac
-else
-        case 4 in
-                $ac_cv_sizeof_int) SIZE32="int";;
-                $ac_cv_sizeof_long) SIZE32="long";;
-                $ac_cv_sizeof_short) SIZE32="short";;
-        esac
-fi
-
-AC_SUBST(SIZE16)
-AC_SUBST(SIZE32)
-
 AM_CONDITIONAL([FIXED_POINT], [test x$ac_enable_fixed = xyes])
 AM_CONDITIONAL([CUSTOM_MODES], [test x$ac_enable_custom_modes = xyes])
 AM_CONDITIONAL([EXTRA_PROGRAMS], [test x$ac_enable_extra_programs = xyes])
@@ -324,7 +290,7 @@ AC_CONFIG_HEADERS([config.h])
 
 AC_OUTPUT
 
-AC_MSG_RESULT([
+AC_MSG_NOTICE([
 ------------------------------------------------------------------------
   $PACKAGE_NAME $PACKAGE_VERSION:  Automatic configuration OK.
 
@@ -348,7 +314,8 @@ AC_MSG_RESULT([
       API documentation: ............. ${ac_enable_doc}
       Extra programs: ................ ${ac_enable_extra_programs}
 ------------------------------------------------------------------------
+
+ Type "make; make install" to compile and install
+ Type "make check" to run the test suite
 ])
 
-echo "Type \"make; make install\" to compile and install";
-echo "Type \"make check\" to run the test suite";