package/libserial: bump to version 1.0.0

package/libserial: bump to version 1.0.0

- Move site to github
- Add gcc >= 5 dependency for C++14:
  https://github.com/crayzeewulf/libserial/commit/cafeffaa60f23012675d908b1e13b89aad3b56b2
- Remove first patch and use --without-python instead
- Remove second patch (patch has been merged in 2015:
  https://github.com/crayzeewulf/libserial/commit/47ca0621ccd2100e4ba0d7f4e2a861d14f05f63c)
- Add a new patch to fix build when size_t is an unsigned int
- Use new --disable-tests option
- Update license to BSD-3-Clause and replace COPYING by LICENSE.txt:
  https://github.com/crayzeewulf/libserial/commit/3f12abc045aae34a40a6fc9a9b5ed0a1bc6b2049
- Add hash for license file

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>