[llvm] [Support] Vendor rpmalloc in-tree and use it for the Windows 64-bit release (PR #91862)

[Alexandre Ganea via llvm-commits]

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@@ -250,7 +252,7 @@ set cmake_flags=^
   -DLLDB_TEST_COMPILER=%stage0_bin_dir%/clang.exe ^
   -DPYTHON_HOME=%PYTHONHOME% ^
   -DPython3_ROOT_DIR=%PYTHONHOME% ^
-  -DLIBXML2_INCLUDE_DIRS=%libxmldir%/include/libxml2 ^
+  -DLIBXML2_INCLUDE_DIR=%libxmldir%/include/libxml2 ^
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aganea wrote:

Removed. We can't build with the latest cmake without this, will propose that in a separate PR.

https://github.com/llvm/llvm-project/pull/91862