meson.setupHook: Add timeout-multiplier

0 ss infinite, nix will take care of the timeout

In loaded environments the tests can take longer to build

(cherry picked from commit 54522e10d5)
(cherry picked from commit a49bc5c9e512fb2bbc5b96c44042a5e330d2116d)

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

@@ -54,6 +54,10 @@ mesonCheckPhase() {
     local flagsArray=()
     concatTo flagsArray mesonCheckFlags mesonCheckFlagsArray
 
+    if [ -z "${dontAddTimeoutMultiplier:-}" ]; then
+        flagsArray+=("--timeout-multiplier=0")
+    fi
+
     echoCmd 'mesonCheckPhase flags' "${flagsArray[@]}"
     meson test --no-rebuild --print-errorlogs "${flagsArray[@]}"