Replace min/max macros with inline functions

[carmiker]

This pull request fixes the warning below:

emu2413/emu2413.c:228:25: warning: comparison of unsigned expression in '< 0' is always false [-Wtype-limits]
  228 | #define max(i, j) (((i) > (j)) ? (i) : (j))
      |                         ^
emu2413/emu2413.c:825:24: note: in expansion of macro 'max'
  825 |         slot->eg_out = max(0, ((int)slot->eg_out - (slot->eg_out >> s) - 1));
      |                        ^~~

This fixes a minor bug I experience in Phantasy Star for the Sega Master System after importing the code into my emulator.
I use musl libc and compile with:

-std=c99 -Wall -Wextra -Wshadow -Wmissing-prototypes -pedantic

References:
https://dustri.org/b/min-and-max-macro-considered-harmful.html
https://stackoverflow.com/questions/3437404/min-and-max-in-c

[okaxaki]

Thanks! I thought these macros are safe since they are scoped only in the emu2413.c. However, considering the type-safety, it's better to avoid to use them.