v24.01 release

* String routine changes
  * Added memcpy, memmove, memset for MOPS extension.
  * Optimized memcpy by improving code alignment.
  * Fixed GNU property note on ILP32.
* Math routine changes
  * Vector math code now uses ACLE intrinsics and aarch64 only.
  * Vector math code no longer builds scalar and base PCS variants.
  * Optimized vector sin and cos.
  * Added tgamma128, a binary128 tgammal implementation.
* pl/ directory
  * This continues to host many math routines with mixed quality.

README

@@ -12,7 +12,7 @@ contribution requirements are documented in README.contributors of
 the appropriate subdirectory.
 
 Regular quarterly releases are tagged as vYY.MM, the latest
-release is v23.01.
+release is v24.01.
 
 Source code layout: