package/cups: Un-deprecate, and update CUPS to 2.1.2

 - Remove 0001-fix-static.patch - Fixed upstream
 - Remove 0002-fix-stack-protector-check.patch - Fixed upstream
 - Remove 0003-mantohtml.patch - Replaced by
   0001-Remove-man-from-BUILDDIRS-in- configure.patch
 - Add 0002-Do-not-use-genstrings.patch
 - Add CUPS_PDFTOPS option to Config.in.legacy - This support was
   moved to the cups-filters package.

Signed-off-by: Olivier Schonken <olivier.schonken@gmail.com>
[Thomas:
 - rewrap patch description in patch 0001
 - adjust patch 0002 to completely remove the call to genstrings
   instead of commenting it, and remove the potentially confusing
   'echo' above it
 - add a third patch that sanitizes the installation process to avoid
   non-working stripping, owernship changes, etc.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>