m[algs] Move roundf() here

src/hb-algs.hh

@@ -150,6 +150,12 @@ struct BEInt<Type, 4>
   private: uint8_t v[4];
 };
 
+/* Floats. */
+
+/* We want our rounding towards +infinity. */
+static inline float
+_hb_roundf (float x) { return floorf (x + .5f); }
+#define roundf(x) _hb_roundf(x)
 
 
 /* Encodes three unsigned integers in one 64-bit number.  If the inputs have more than 21 bits,
@@ -165,6 +171,7 @@ struct BEInt<Type, 4>
 #define HB_CODEPOINT_DECODE3_11_7_14_2(v) ((hb_codepoint_t) (((v) >> 14) & 0x007Fu) | 0x0300)
 #define HB_CODEPOINT_DECODE3_11_7_14_3(v) ((hb_codepoint_t) (v) & 0x3FFFu)
 
+
 struct
 {
   /* Note.  This is dangerous in that if it's passed an rvalue, it returns rvalue-reference. */

src/hb.hh

@@ -448,11 +448,6 @@ static_assert ((sizeof (hb_mask_t) == 4), "");
 static_assert ((sizeof (hb_var_int_t) == 4), "");
 
 
-static inline float
-_hb_roundf (float x) { return floorf (x + .5f); }
-#define roundf(x) _hb_roundf(x)
-
-
 /*
  * For lack of a better place, put Zawgyi script hack here.
  * https://github.com/harfbuzz/harfbuzz/issues/1162