message: doc: add glibc to dependencies.md
diff: @@ -12,6 +12,7 @@ These are the dependencies currently used by Peercoin. You can find instructions
  | fontconfig | [2.12.1](https://www.freedesktop.org/software/fontconfig/release/) | | No | Yes | |
  | FreeType | [2.7.1](https://download.savannah.gnu.org/releases/freetype) | | No | | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) (Android only) |
  | GCC | | [7+](https://gcc.gnu.org/) (C++17 support) | | | |
  +| glibc | | [2.17](https://www.gnu.org/software/libc/) | | | | |
  | HarfBuzz-NG | | | | | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) |
  | libevent | [2.1.12-stable](https://github.com/libevent/libevent/releases) | [2.0.21](https://github.com/bitcoin/bitcoin/pull/18676) | No | | |
  | libnatpmp | git commit [4536032...](https://github.com/miniupnp/libnatpmp/tree/4536032ae32268a45c073a4d5e91bbab4534773a) | | No | | |
  