Remove dependency on libc and libm

Author: gil0mendes

src/pulsar.rs

@@ -52,6 +52,4 @@ extern {
     pub fn memalign(align: ::size_t, size: ::size_t) -> *mut ::c_void;
 }
 
-#[link(name = "c")]
-#[link(name = "m")]
 extern {}