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/m_Do/m_Do_machine.cpp b/src/m_Do/m_Do_machine.cpp
index 08ede9161a..1223da03a1 100644
--- a/src/m_Do/m_Do_machine.cpp
+++ b/src/m_Do/m_Do_machine.cpp
@@ -580,7 +580,7 @@ static void fault_callback_scroll(u16, OSContext* p_context, u32, u32) {
     JUTException* manager = JUTException::getManager();
     JUTConsole* exConsole = manager->getConsole();
 
-    u32 srr0 = p_context->srr0 & -4;
+    uintptr_t srr0 = p_context->srr0 & -4;
     if (srr0 >= 0x8000000C && srr0 < 0x82FFFFFF) {
         exConsole->print_f("(SRR0-3):%08X %08X %08X %08X\n", *(u32*)(srr0 - 0xC),
                            *(u32*)(srr0 - 0x8), *(u32*)(srr0 - 0x4), *(u32*)srr0);