dropbear: fix -ltomcrypt -ltommath order when using system libtom libs
To prevent build failures when using system libtom libraries and
linking with --as-needed, LIBTOM_LIBS should be in the order
-ltomcrypt -ltommath, not the other way around, ie libs should be
prepended to LIBTOM_LIBS as they are found, not appended.
Note that LIBTOM_LIBS is not used when linking with the bundled
libtom libs.
Signed-off-by: Andre McCurdy <armccurdy@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
