Review Request 125561: Sync FindGettext.cmake macros with upstream module from CMake

[Hrvoje Senjan]

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https://git.reviewboard.kde.org/r/125561/
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Review request for Build System, kdelibs, Localization and Translation (l10n), Albert Astals Cid, and Alexander Neundorf.


Repository: kdelibs


Description
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Otherwise some apps fail to build with kdelibs >= 4.14.11:
```
CMake Error at /usr/share/kde4/apps/cmake/modules/FindGettext.cmake:232 (ADD_CUSTOM_TARGET):
  add_custom_target cannot create target "pofiles" because another target
  with the same name already exists.  The existing target is a custom target
  created in source directory
  "/home/hrvoje/rpmbuild/BUILD/skanlite-1.1/po/be".  See documentation for
  policy CMP0002 for more details.
Call Stack (most recent call first):
  po/zh_CN/CMakeLists.txt:2 (GETTEXT_PROCESS_PO_FILES)
```


Diffs
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  cmake/modules/FindGettext.cmake 91e88f7 

Diff: https://git.reviewboard.kde.org/r/125561/diff/


Testing
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Skanlite now builds.


Thanks,

Hrvoje Senjan

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