Remove unused variables

Declare float type conditionally to not declare them conditionally when
they are not used.

arm-gen.c

@@ -23,8 +23,10 @@
 #ifdef TARGET_DEFS_ONLY
 
 #ifdef TCC_ARM_EABI
+#ifndef TCC_ARM_VFP // Avoid useless warning
 #define TCC_ARM_VFP
 #endif
+#endif
 
 /* number of available registers */
 #ifdef TCC_ARM_VFP
@@ -100,8 +102,10 @@ enum {
 //#define FUNC_STRUCT_PARAM_AS_PTR
 
 #if defined(TCC_ARM_EABI) && defined(TCC_ARM_VFP)
+#ifdef NEED_FLOAT_TYPES
 static CType float_type, double_type, func_float_type, func_double_type;
 #define func_ldouble_type func_double_type
+#endif
 #else
 #define func_float_type func_old_type
 #define func_double_type func_old_type

libtcc.c

@@ -18,6 +18,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#define NEED_FLOAT_TYPES
 #include "tcc.h"
 
 /********************************************************/