man-pages: remove conflict pages

Remove the pages which libxcrypt and shadow already have to avoid
following conflicts during install man-pages and libxcrypt/shadow at the
same time.

Error: Transaction test error:
  file /usr/share/man/man3/crypt.3 from install of
  libcrypt-doc-4.4.33-r0.x86_64 conflicts with file from package
  man-pages-6.04-r0.x86_64

Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>