mips: switch float_t to float

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/sysdeps/linux/mips/bits/mathdef.h

@@ -25,10 +25,9 @@
 #if defined  __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
 # define _MATH_H_MATHDEF	1
 
-/* Normally, there is no long double type and the `float' and `double'
-   expressions are evaluated as `double'.  */
-typedef double float_t;		/* `float' expressions are evaluated as
-				   `double'.  */
+/* MIPS has both `float' and `double' arithmetic.  */
+typedef float float_t;		/* `float' expressions are evaluated as
+				   `float'.  */
 typedef double double_t;	/* `double' expressions are evaluated as
 				   `double'.  */