Remove unused patchelf inputs.

* gnu/packages/maths.scm (lapack, gmsh), gnu/packages/ssh.scm (libssh): Remove
  unused patchelf from native-inputs.

gnu/packages/maths.scm

@@ -283,7 +283,6 @@ large scale eigenvalue problems.")
         "0lk3f97i9imqascnlf6wr5mjpyxqcdj73pgj97dj2mgvyg9z1n4s"))))
     (build-system cmake-build-system)
     (home-page "http://www.netlib.org/lapack/")
-    (native-inputs `(("patchelf" ,patchelf))) ;for augment-rpath
     (inputs `(("fortran" ,gfortran-4.8)
               ("python" ,python-2)))
     (arguments
@@ -435,7 +434,6 @@ files.")
        ;; Remove non-free METIS code
        '(delete-file-recursively "contrib/Metis"))))
     (build-system cmake-build-system)
-    (native-inputs `(("patchelf" ,patchelf))) ;for augment-rpath
     (propagated-inputs
      `(("fltk" ,fltk)
        ("gfortran" ,gfortran-4.8)

gnu/packages/ssh.scm

@@ -72,7 +72,6 @@
                ;; fields of 'gcry_thread_cbs' that are now private:
                ;; src/threads.c:72:26: error: 'struct gcry_thread_cbs' has no member named 'mutex_init'
               ("libgcrypt", libgcrypt-1.5)))
-    (native-inputs `(("patchelf" ,patchelf)))
     (synopsis "SSH client library")
     (description
      "libssh is a C library implementing the SSHv2 and SSHv1 protocol for