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build: Check for dependency 'help2man'

Dagur Valberg Johannsson requested to merge dagurval/bitcoin-cash-node:help2man-error into master

Check for dependency 'help2man' and give a error message with hint on how to fix build issue when missing.

Build error before:

% ninja
[86/174] Generating man/bitcoind.1
FAILED: doc/man/bitcoind.1 /Users/dagurval/bitcoin-cash-node/build/doc/man/bitcoind.1 
cd /Users/dagurval/bitcoin-cash-node/build/doc/man && ./gen-doc-man.sh bitcoind
./gen-doc-man.sh: line 23: help2man: command not found
ninja: build stopped: subcommand failed.

Build error after:

CMake Error at doc/CMakeLists.txt:36 (message):
  Failed to find the program 'help2man' required for building manpages.
  Please make sure that it is installed and reachable through the system
  PATH.  To disable manpages, add cmake build option '-DENABLE_MAN=OFF'.
Edited by Dagur Valberg Johannsson

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