For some reason, CMake 2.8.12.2 did not expand the list argument in a
single DEPENDS argument. Remove the quotes, so it gets expanded into
multiple arguments for add_custom_command and add_custom_target.
Fixes https://github.com/curl/curl/issues/1370Closes#1372
Also make Perl mandatory to allow building the docs.
While CMakeLists.txt could probably read the list of manual pages from
Makefile.am, actually putting those in CMakeLists.txt is cleaner so that
is what is done here.
Fixes#1230
Ref: https://github.com/curl/curl/pull/1288