There is a new pull request by repk against master on the void-packages repository

https://github.com/repk/void-packages php-opcache-cross
https://github.com/void-linux/void-packages/pull/32899

php: Support opcache cross compilation
Opcache extension configuration tries to detect some shared memory
function by compiling and executing test programs at compile time.
This cannot work when cross compiling.

To workaround that add proper defines to use those functions anyway if
we are cross compiling.

That fixes the following error when using opcache extension on arm:
Fatal Error Unable to allocate shared memory segment of 134217728 bytes

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#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [x] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

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  - [ ] armv6l-musl
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A patch file from https://github.com/void-linux/void-packages/pull/32899.patch is attached