x86: Remove x87 support from interpreter.

SSE2 required from now on.

src/lj_vm.h

@@ -49,12 +49,14 @@ LJ_ASMF void lj_vm_exit_handler(void);
 LJ_ASMF void lj_vm_exit_interp(void);
 
 /* Internal math helper functions. */
-#if LJ_TARGET_X86ORX64 || LJ_TARGET_PPC
+#if LJ_TARGET_PPC
 #define lj_vm_floor	floor
 #define lj_vm_ceil	ceil
 #else
 LJ_ASMF double lj_vm_floor(double);
+#if !LJ_TARGET_X86ORX64
 LJ_ASMF double lj_vm_ceil(double);
+#endif
 #if LJ_TARGET_ARM
 LJ_ASMF double lj_vm_floor_sf(double);
 LJ_ASMF double lj_vm_ceil_sf(double);