More MSVC build fixes

Ported an inline assembler snippet in x86 new dynarec to MSVC "__asm" syntax.

src/codegen_new/codegen_backend_x86.c

@@ -304,12 +304,20 @@ void codegen_backend_init()
         block_write_data = NULL;
 
         cpu_state.old_fp_control = 0;
+#ifndef _MSC_VER
         asm(
                 "fstcw %0\n"
                 "stmxcsr %1\n"
                 : "=m" (cpu_state.old_fp_control2),
                   "=m" (cpu_state.old_fp_control)
         );
+#else
+        __asm
+        {
+                fstcw cpu_state.old_fp_control2
+                stmxcsr cpu_state.old_fp_control
+        }
+#endif
         cpu_state.trunc_fp_control = cpu_state.old_fp_control | 0x6000;
 }