Add memalign for Solaris

Unlike Illumos and Solaris 11, Solaris 10 does not support posix_memalign, so this change is needed for Solaris 10 support.

Author: bgermann

src/unix/solaris/mod.rs

@@ -1245,6 +1245,8 @@ extern {
 
 pubfnmsync(addr:*mut::c_void,len:::size_t,flags:::c_int) -> ::c_int;
 
+pubfnmemalign(align:::size_t,size:::size_t) -> *mut::c_void;
+
 pubfnrecvfrom(socket:::c_int,buf:*mut::c_void,len:::size_t,
 flags:::c_int,addr:*mut::sockaddr,
 addrlen:*mut::socklen_t) -> ::ssize_t;