* Fix math unit compilation failure

git-svn-id: branches/fixes_2_4@16425 -

rtl/x86_64/mathu.inc

@@ -15,6 +15,7 @@
 {$ASMMODE GAS}
 
 {$ifndef win64}
+{$define FPC_MATH_HAS_ARCTAN2}
 function arctan2(y,x : float) : float;assembler;
   asm
      fldt y