package/ngircd: security bump to version 26

package/ngircd: security bump to version 26

- Fix CVE-2020-14148: The Server-Server protocol implementation in
  ngIRCd before 26~rc2 allows an out-of-bounds access, as demonstrated
  by the IRC_NJOIN() function.
- Fix a static build failure with openssl thanks to
  https://github.com/ngircd/ngircd/commit/ad86a41eeed9f85d74bb50a25fa0bf4515aaf3af
- Update indentation in hash file (two spaces)

Fixes:
 - http://autobuild.buildroot.org/results/078a7afc432786316a1d2ea03f96444ff741b942

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