There's a merged pull request on the void-packages repository

rawtherapee: remove tcmalloc to fix crash on aarch64-musl
https://github.com/void-linux/void-packages/pull/51021

Description:
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The application fails to start on my aarch64-musl device. I discovered that this is likely caused by tcmalloc.

Using tcmalloc doesn't seem to make a significant difference on other platforms, and its not enabled by default `CMakeLists.txt` so I think its best to remove it on all platforms

#### Testing the changes
- I tested the changes in this PR: **YES**

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#### Local build testing
- I built this PR locally for my native architecture, x86_64-glibc, aarch64-musl
- I built this PR locally for these architectures (if supported. mark crossbuilds):
  - x86_64-musl
  - i686
  - aarch64 (native + cross)
  - aarch64-musl (native + cross)
  - armv7l (cross)
  - armv7l-musl (cross)
  - armv6l (cross)
  - armv6l-musl (cross)