Errors compiling on GCC 7

[glebm]

I get some errors from these abs calls when compiling on GCC7

pcsx4all/src/recompiler/mips/rec_mdu.cpp.h

Lines 354 to 360 in 21084ac

	uint8_t rt_pot = (rt_val != 0x80000000) && ((abs(rt_val) & (abs(rt_val) - 1)) == 0);
	if (rt_pot) {
	u32 rs = regMipsToHost(_Rs_, REG_LOAD, REG_REGISTER);
	// Count trailing 0s of const power-of-two divisor to get right-shift amount
	u32 pot_val = (u32)abs(rt_val);

Here, rt_val is defined as unsigned (u32), and GCC7 doesn't know which overload of abs to pick.

Error message: https://gist.github.com/glebm/7c11ff8d56a6cc35db2f9170a4974a0e

[glebm]

Ah, I think these were meant to be signed in that function.

[glebm]

Sent a fix upstream senquack/pcsx4all#2

[gameblabla]

I fixed it another way but seems like you've found a proper fix.