Log Message:
Update gnustep-base to 1.24.0.

Noteworthy changes in version `1.24.0'
======================================

   * There is binary incompatibility on 64bit systems in that the value
     of the NSNotFound constant there is now 64bits rather than 32bits.

   * gcc-4.0 is the minimum official supported compiler for GNUstep

   * Support for the GNU LANGUAGES environment variable and other locale
     improvements

   * IPV6 support for NSHost and networking operations

   * Support for UTF-8 string literals in source (compiler permitting)

Noteworthy changes in version `1.23.0'
======================================

   * Support for automatic reference counting (ARC) when using clasng
     and the GNUstep Objective-C 2.0 runtime 1.5 or later.

   * Full support for weak references in NSHashTable, NSMapTable and
     NSPointerArray when using clang and the GNUstep Objective-C 2.0
     runtime 1.5 or later.

Noteworthy changes in version `1.22.0'
======================================

   * Many updates and new classes

   * There is now a regression test framework included with the package

   * New support for Objective-C 2.0