More GCC compatibility/warning fixes (#3118)

* Wrap >4-char literals in a MULTI_CHAR macro

Modern compilers do not support CW's non-standard behavior with
>4 char literals. We can, however, use a constexpr function to
compute the u64 values directly. This leaves <=4 char literals
unchanged.

* Replace non-pointer usages of NULL with 0

* Define NULL to nullptr on C++11 and above

* Fix more -Wpointer-arith and -Woverflow warnings

* Replace u32/s32 with uintptr_t/intptr_t where appropriate

* JSUOutputStream: Overload all standard int types

1 files changed, 1 insertions, 1 deletions

diff --git a/src/Z2AudioLib/Z2Audience.cpp b/src/Z2AudioLib/Z2Audience.cpp
index 46b7107473..5e8522701b 100644
--- a/src/Z2AudioLib/Z2Audience.cpp
+++ b/src/Z2AudioLib/Z2Audience.cpp
@@ -454,7 +454,7 @@ f32 Z2SpotMic::calcMicVolume(f32 param_0, int camID, f32 param_2) {
     JUT_ASSERT(687, camID >= 0);
     JUT_ASSERT(688, camID < 1);
 
-    if (mMicOn == NULL) {
+    if (mMicOn == false) {
         return param_2;
     }