o remove old bsnes version

tools/bsnes/ppu/bppu/bppu_render_addsub.cpp

@@ -1,25 +0,0 @@
-#ifdef BPPU_CPP
-
-//color addition / subtraction
-//thanks go to blargg for the optimized algorithms
-inline uint16 bPPU::addsub(uint32 x, uint32 y, bool halve) {
-  if(!regs.color_mode) {
-    if(!halve) {
-      unsigned sum   = x + y;
-      unsigned carry = (sum - ((x ^ y) & 0x0421)) & 0x8420;
-      return (sum - carry) | (carry - (carry >> 5));
-    } else {
-      return (x + y - ((x ^ y) & 0x0421)) >> 1;
-    }
-  } else {
-    unsigned diff   = x - y + 0x8420;
-    unsigned borrow = (diff - ((x ^ y) & 0x8420)) & 0x8420;
-    if(!halve) {
-      return   (diff - borrow) & (borrow - (borrow >> 5));
-    } else {
-      return (((diff - borrow) & (borrow - (borrow >> 5))) & 0x7bde) >> 1;
-    }
-  }
-}
-
-#endif