message: doc: update minimum compiler requirements for std::filesystem
diff: @@ -7,11 +7,11 @@ These are the dependencies currently used by Peercoin. You can find instructions
  | --- | --- | --- | --- | --- | --- |
  | Berkeley DB | [4.8.30](https://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html) | 4.8.x | No | | |
  | Boost | [1.71.0](https://www.boost.org/users/download/) | [1.64.0](https://github.com/bitcoin/bitcoin/pull/22320) | No | | |
  -| Clang<sup>[ \* ](#note1)</sup> | | [5.0+](https://releases.llvm.org/download.html) (C++17 support) | | | |
  +| Clang<sup>[ \* ](#note1)</sup> | | [7.0](https://releases.llvm.org/download.html) (C++17 & std::filesystem support) | | | |
  | Expat | [2.2.7](https://libexpat.github.io/) | | No | Yes | |
  | 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) | | | |
  +| GCC | | [8.1](https://gcc.gnu.org/) (C++17 & std::filesystem 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 | | |
  