Jemalloc : Disable for macOS builds

Jemalloc 3.6.0 is too old to be compatible with macOS 14 & Xcode 15, reporting `configure: error: Unsupported malloc zone version` when configuring the build.

We could build Jemalloc with `--enable-zone-allocator=no` but that would prevent it from acting as the default allocator on macOS. We'd need to update to Jemalloc 5.3.0, or look at alternative allocators.

Author: murraystevenson

Changes.md

@@ -4,6 +4,7 @@
 - Boost : Updated to version 1.85.0.
 - Cortex : Updated to version 10.7.0.0a2.
 - Imath : Updated to version 3.1.12.
+- Jemalloc : Removed when building on macOS.
 - LLVM : Updated to version 17.0.6.
 - OpenColorIO : Updated to version 2.4.2.
 - OpenEXR : Updated to version 3.3.6.

Jemalloc/config.py

@@ -24,4 +24,10 @@
 		"lib/libjemalloc*{sharedLibraryExtension}*",
 
 	],
+
+	"platform:macos" : {
+
+		"enabled" : False,
+
+	},
 }