package/openswan: bump to version 3.0.0

package/openswan: bump to version 3.0.0

- Drop patch (already in version)
- Use USE_NOMANINSTALL which is available since version 2.6.52 and
  https://github.com/xelerance/Openswan/commit/9146de03c8c9eb4e55389599ce44aa8f773b2990
- openswan can be built on musl since version 2.6.52.1 and
  https://github.com/xelerance/Openswan/commit/ddb6086c50b5d087ebcabb580914b026aa71200e
- openswan can't be built on uclibc-ng anymore and upstream rejected the
  patch to fix the build failure:
  https://github.com/xelerance/Openswan/pull/453
- Update indentation in hash file (two spaces)

https://github.com/xelerance/Openswan/releases/tag/v3.0.0

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