wafHook: Refactored wafHook to use callPackage (#64250)

This is to enable custom wafHook with custom waf via the override
system.

pkgs/development/tools/build-managers/waf/setup-hook.sh

@@ -1,65 +0,0 @@
-wafConfigurePhase() {
-    runHook preConfigure
-
-    if ! [ -f "${wafPath:=./waf}" ]; then
-        echo "copying waf to $wafPath..."
-        cp @waf@ "$wafPath"
-    fi
-
-    if [ -z "${dontAddPrefix:-}" ] && [ -n "$prefix" ]; then
-        wafConfigureFlags="${prefixKey:---prefix=}$prefix $wafConfigureFlags"
-    fi
-
-    local flagsArray=(
-        @crossFlags@
-        "${flagsArray[@]}"
-        $wafConfigureFlags "${wafConfigureFlagsArray[@]}"
-        ${configureTargets:-configure}
-    )
-    echoCmd 'configure flags' "${flagsArray[@]}"
-    python "$wafPath" "${flagsArray[@]}"
-
-    runHook postConfigure
-}
-
-wafBuildPhase () {
-    runHook preBuild
-
-    # set to empty if unset
-    : ${wafFlags=}
-
-    local flagsArray=(
-      ${enableParallelBuilding:+-j ${NIX_BUILD_CORES}}
-      $wafFlags ${wafFlagsArray[@]}
-      $buildFlags ${buildFlagsArray[@]}
-      ${buildTargets:-build}
-    )
-
-    echoCmd 'build flags' "${flagsArray[@]}"
-    python "$wafPath" "${flagsArray[@]}"
-
-    runHook postBuild
-}
-
-wafInstallPhase() {
-    runHook preInstall
-
-    if [ -n "$prefix" ]; then
-        mkdir -p "$prefix"
-    fi
-
-    local flagsArray=(
-        $wafFlags ${wafFlagsArray[@]}
-        $installFlags ${installFlagsArray[@]}
-	${installTargets:-install}
-    )
-
-    echoCmd 'install flags' "${flagsArray[@]}"
-    python "$wafPath" "${flagsArray[@]}"
-
-    runHook postInstall
-}
-
-configurePhase=wafConfigurePhase
-buildPhase=wafBuildPhase
-installPhase=wafInstallPhase