fix: Fixed overflow warnings when code not processed due to IF.

Even though CALLs and JPs are avoided, values were being evaluated. This
is avoided by including also the conditional check in values.

src/dura.y

@@ -3340,26 +3340,32 @@ value_real: REAL
 
 value_3bits: value
  {
- if (($1 < 0) || ($1 > 7))
- warning_message(3, fname_src, lines, pass, &warnings);
- $$ = $1 & 0x07;
+ if (conditional[conditional_level]) {
+ if (($1 < 0) || ($1 > 7))
+ warning_message(3, fname_src, lines, pass, &warnings);
+ $$ = $1 & 0x07;
+ }
  }
 ;
 
 value_8bits: value
  {
- if (($1 > 255) || ($1 < -128)) {
- warning_message(2, fname_src, lines, pass, &warnings);
+ if (conditional[conditional_level]) {
+ if (($1 > 255) || ($1 < -128)) {
+ warning_message(2, fname_src, lines, pass, &warnings);
+ }
+ $$ = $1 & 0xff;
  }
- $$ = $1 & 0xff;
  }
 ;
 
 value_16bits: value
  {
- if (($1 > 65535) || ($1 < -32768))
- warning_message(1, fname_src, lines, pass, &warnings);
- $$ = $1 & 0xffff;
+ if (conditional[conditional_level]) {
+ if (($1 > 65535) || ($1 < -32768))
+ warning_message(1, fname_src, lines, pass, &warnings);
+ $$ = $1 & 0xffff;
+ }
  }
 ;
 
@@ -3693,7 +3699,8 @@ void msx_bios_vars()
 void write_byte(int b)
 {
  /* If the condition of this block is fulfilled, create the code */
- if ((!conditional_level) || (conditional[conditional_level]))
+ // if ((!conditional_level) || (conditional[conditional_level]))
+ if (conditional[conditional_level])
  {
  if (rom_type != MEGAROM)
  {