std: rewrote math to support most C95 libmath calls on f32, f64 and float

Author: boggle

src/lib/ctypes.rs

@@ -5,6 +5,7 @@ Definitions useful for C interop
 */
 
 type c_int = i32;
+
 type long = int;
 type unsigned = u32;
 type ulong = uint;
@@ -13,6 +14,9 @@ type intptr_t = uint;
 type uintptr_t = uint;
 type uint32_t = u32;
 
+// This *must* match with "import c_float = fXX" in std::math per arch
+type c_float = f64;
+
 type size_t = uint;
 type ssize_t = int;
 type off_t = uint;