Phase out integer typedefs and macros in favor of C/C++ Standard ones

Back when compiler standardization was a mess, we created equally messy sets of typedefs and macros and toggled between them with {{ifdef}}s.

• my_global.h
• InnoDB: univ.i

Starting with 77c184df7c though, we’ve adopted the standards C99 and C++11, which already defines fix-width integers and printf specifiers universally.

Switching to the standardized typedefs and macros modernizes our code and improves:

• Readability, especially for new but experienced members from a standardized background.
• Consistency – int32_t, uint16_t, intptr_t and more are also in use (the last time I checked).
• Compilation time: marko says these checks slow CMake’s single-threaded setup phase.
• File sizes (more for deduplication)

InnoDB misleadingly defines ulint/ULINTPF as size_t/%zu as an hack to solve MDEV-12488. Someone who doesn’t know (like past me) would easily cast it (64-bit on x64) to ulong (32-bit on Windows) by accident. We should directly replace them with size_t/%zu.