package/botan: bump version to 2.7.0

package/botan: bump version to 2.7.0

Depends on gcc >= 4.8:
https://github.com/randombit/botan/blob/master/readme.rst

Rebased patch 0001, added license hash and updated license path.

Updated configure options for shared/static libraries after commit
https://github.com/randombit/botan/commit/299119f02c09e7d3e657b13e1706cb653eff560c

Added configure for ssp support after commit
https://github.com/randombit/botan/commit/ebeae68aba0d3384a00fddde77a561bb0cd88102
This fixes a build error with toolchains without ssp support.

Removed dependency to gmp:
https://github.com/randombit/botan/issues/719

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>