add precompile pidlocking to NEWS

Author: IanButterworth

HISTORY.md

@@ -37,6 +37,9 @@ Compiler/Runtime improvements
 * The mark phase of the garbage collector is now multi-threaded ([#48600]).
 * [JITLink](https://llvm.org/docs/JITLink.html) is enabled by default on Linux aarch64 when Julia is linked to LLVM 15 or later versions ([#49745]).
   This should resolve many segmentation faults previously observed on this platform.
+* The precompilation process now uses pidfile locks and orchestrates multiple julia processes to only have one process
+  spend effort precompiling while the others wait. Previously all would do the work and race to overwrite the cache files.
+  ([#49052])
 
 Command-line option changes
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