Summary:
Original title: **[RN] Do not encode path to cmake in hermes-engine Pod, build hermesc in prepare_pods**
The result of `#{%x(command -v cmake | tr -d '\n')}` was being encoded into the `hermes-engine` Pod. This can lead to conflicts in the CocoaPods cache when `pod install` is run on different machines.
Instead of running the command during `pod install`, we defer to the actual build scripts so they can find `cmake` when `$CMAKE_BINARY` is not set.
More importantly, this fixes an issue that crept into the Sandcastle CocoaPods offline mirrors, but which would only manifest itself when people run `js1 oss prepare-pods`.
RNTester would not build due to RNTesterPods.xcworkspace being configured to use cmake from an arbitrary path instead of using the cmake from $PATH.
This does not affect Sandcastle due to `CMAKE_BINARY` getting overriden in Sandcastle.
---
**Update** by dmytrorykun:
It is impossible to address the problem described in the original title by simply adding `CMAKE_BINARY=${CMAKE_BINARY:-cmake}` to `build-hermes-xcode.sh`. This script is supposed to run from Xcode. Since Xcode doesn't have access to system `PATH` variable, it is unable to locate `cmake`, and build fails.
However this diff contains other useful changes:
1. Remove trailing newline in `cmake` path in `build-hermes-xcode.sh`.
2. Fix inverted logic in `copy-hermes-xcode.sh`.
3. Fix typo in `remove xcuserdata` step in Sandcastle.
4. Remove unused `HERMES_DISABLE_HERMESC_BUILD`.
Changelog:
[iOS] [Fixed] - Various fixes for Hermes build-from-source behaviour.
Reviewed By: cipolleschi
Differential Revision: D41139384
fbshipit-source-id: 4a4a44a7ac201d279718d84cd02d60b4eaf3956b
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