meson.setupHook: fix enableParallelChecking

Previously, this controlled the parallelism of building the tests.
The tests were then always run in parallel.  Fix so
enableParallelBuilding controls building, and enableParallelChecking
controls the test run.

Fixes: bb73d9a0ce ("meson: support enableParallelChecking")

pkgs/by-name/me/meson/setup-hook.sh

@@ -63,16 +63,22 @@ mesonCheckPhase() {
         flagsArray+=("--timeout-multiplier=0")
     fi
 
-    # Parallel checking is enabled by default.
+    # Parallel building is enabled by default.
     local buildCores=1
-    if [ "${enableParallelChecking-1}" ]; then
+    if [ "${enableParallelBuilding-1}" ]; then
         buildCores="$NIX_BUILD_CORES"
     fi
 
     TERM=dumb ninja -j"$buildCores" $ninjaFlags "${ninjaFlagsArray[@]}" meson-test-prereq
 
+    # Parallel checking is enabled by default.
+    local testCores=1
+    if [ "${enableParallelChecking-1}" ]; then
+        testCores="$NIX_BUILD_CORES"
+    fi
+
     echoCmd 'mesonCheckPhase flags' "${flagsArray[@]}"
-    meson test --no-rebuild --print-errorlogs --max-lines=1000000 "${flagsArray[@]}"
+    meson test -j"$testCores" --no-rebuild --print-errorlogs --max-lines=1000000 "${flagsArray[@]}"
 
     runHook postCheck
 }