package/ci: build in parallel also on iOS.

FUCKING stupid defaults. CMake's default no less stupid. I'm MAD, why
would anybody even want to have the build run sequentially on todays
machines?! If your build is crap and can't run in parallel, FIX YOUR
CODE, but don't make the other 99% users suffer!!

package/ci/circleci.yml

@@ -589,6 +589,10 @@ jobs:
     environment:
       # STUPID yml interprets unquoted ON as a boolean
       TARGET_GLES2: "OFF"
+      # Yep, xcodebuild is beyond stupid and just DOESN'T build in parallel by
+      # default. The default medium resource class has 4 CPUs and Ninja uses
+      # -j6, so do the same for xcodebuild.
+      XCODE_JOBS: 6
     steps:
     - install-base-macos:
         extra: xcbeautify

package/ci/ios-simulator-gles.sh

@@ -32,7 +32,7 @@ cmake .. \
     -DCORRADE_TESTSUITE_TARGET_XCTEST=ON \
     -DCORRADE_WITH_INTERCONNECT=OFF \
     -G Xcode
-set -o pipefail && cmake --build . --config Release --target install | xcbeautify
+set -o pipefail && cmake --build . --config Release --target install -j$XCODE_JOBS | xcbeautify
 cd ../..
 
 # Crosscompile SDL. On 2022-14-02 curl says the certificate is expired, so
@@ -41,7 +41,7 @@ cd ../..
 curl --insecure -O https://www.libsdl.org/release/SDL2-2.0.10.tar.gz
 tar -xzvf SDL2-2.0.10.tar.gz
 cd SDL2-2.0.10/Xcode-iOS/SDL
-set -o pipefail && xcodebuild -sdk iphonesimulator13.7 | xcbeautify
+set -o pipefail && xcodebuild -sdk iphonesimulator13.7 -jobs $XCODE_JOBS -parallelizeTargets | xcbeautify
 cp build/Release-iphonesimulator/libSDL2.a $HOME/deps/lib
 mkdir -p $HOME/deps/include/SDL2
 cp -R ../../include/* $HOME/deps/include/SDL2
@@ -78,11 +78,11 @@ cmake .. \
     -DMAGNUM_BUILD_TESTS=ON \
     -DMAGNUM_BUILD_GL_TESTS=ON \
     -G Xcode
-set -o pipefail && cmake --build . --config Release | xcbeautify
+set -o pipefail && cmake --build . --config Release -j$XCODE_JOBS | xcbeautify
 # TODO: find a better way to avoid
 # Library not loaded: /System/Library/Frameworks/OpenGLES.framework/OpenGLES
 # error
 DYLD_FALLBACK_LIBRARY_PATH="/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 12.4.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/OpenGLES.framework" DYLD_FALLBACK_FRAMEWORK_PATH="/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 12.4.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks" CORRADE_TEST_COLOR=ON ctest -V -C Release -E "GLTest|GLBenchmark"
 
 # Test install, after running the tests as for them it shouldn't be needed
-set -o pipefail && cmake --build . --config Release --target install | xcbeautify
+set -o pipefail && cmake --build . --config Release --target install -j$XCODE_JOBS | xcbeautify