ninja: pipe ninja output through cat in hooks

ninja build progress output is not line-base, it overwrites the same
line over and over again with its progress reporting. nix is line-based
though, so ninja-based builds have their progress hidden. pipe ninja
output through cat to avoid this.

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

@@ -14,7 +14,7 @@ ninjaBuildPhase() {
     )
 
     echoCmd 'build flags' "${flagsArray[@]}"
-    ninja "${flagsArray[@]}"
+    ninja "${flagsArray[@]}" | cat
 
     runHook postBuild
 }
@@ -33,7 +33,7 @@ ninjaInstallPhase() {
     )
 
     echoCmd 'install flags' "${flagsArray[@]}"
-    ninja "${flagsArray[@]}"
+    ninja "${flagsArray[@]}" | cat
 
     runHook postInstall
 }
@@ -67,7 +67,7 @@ ninjaCheckPhase() {
         )
 
         echoCmd 'check flags' "${flagsArray[@]}"
-        ninja "${flagsArray[@]}"
+        ninja "${flagsArray[@]}" | cat
     fi
 
     runHook postCheck