ci(macOS): Remove unneeded CMAKE_BUILD_PARALLEL_LEVEL

Ninja builds are always run in parallel, based by default on the number
of CPUs the system has.

Author: guihkx

.github/workflows/macos.yml

@@ -36,7 +36,6 @@ jobs:
         env:
           VERBOSE: 1
         run: |
-          export CMAKE_BUILD_PARALLEL_LEVEL=$(sysctl -n hw.logicalcpu)
           cmake . --warn-uninitialized --warn-unused-vars \
               -G Ninja -B build \
               -DCMAKE_BUILD_TYPE=${{ matrix.build-type }} \
@@ -102,7 +101,6 @@ jobs:
         env:
           VERBOSE: 1
         run: |
-          export CMAKE_BUILD_PARALLEL_LEVEL=$(sysctl -n hw.logicalcpu)
           cmake . --warn-uninitialized --warn-unused-vars \
               -B build -G Ninja \
               -DCMAKE_OSX_DEPLOYMENT_TARGET=11.0 \

docs/build_on_macos.md

@@ -26,12 +26,6 @@ git clone https://github.com/nuttyartist/notes.git --recurse-submodules
 cd notes
 ```
 
-Optionally, if you want to dedicate all cores of your CPU to build Notes much faster, set this environment variable:
-
-```shell
-export CMAKE_BUILD_PARALLEL_LEVEL=$(sysctl -n hw.logicalcpu)
-```
-
 After that, we're ready to build Notes!
 
 Invoke CMake to configure and build the project into a folder called `build`, in [`Release` mode](https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html):