shader_recompiler,video_core: Cleanup some GCC and Clang errors

Mostly fixing unused *, implicit conversion, braced scalar init,
fpermissive, and some others.

Some Clang errors likely remain in video_core, and std::ranges is still
a pertinent issue in shader_recompiler

shader_recompiler: cmake: Force bracket depth to 1024 on Clang
Increases the maximum fold expression depth

thread_worker: Include condition_variable

Don't use list initializers in control flow

Co-authored-by: ReinUsesLisp <reinuseslisp@airmail.cc>

src/shader_recompiler/frontend/maxwell/translate/impl/integer_add.cpp

@@ -68,7 +68,6 @@ void IADD(TranslatorVisitor& v, u64 insn, IR::U32 op_b) {
     } const iadd{insn};
 
     const bool po{iadd.three_for_po == 3};
-    const bool neg_a{!po && iadd.neg_a != 0};
     if (!po && iadd.neg_b != 0) {
         op_b = v.ir.INeg(op_b);
     }