Review Request 129316: Add new cmake module `FindLibinotify.cmake`.

[Tobias Berner]

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https://git.reviewboard.kde.org/r/129316/
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Review request for Extra Cmake Modules, Adriaan de Groot, Gleb Popov, and Raphael Kubo da Costa.


Repository: extra-cmake-modules


Description
-------

FreeBSD also has inotify. However it is a library and not a kernel subsystem.


With that change, targets checking for sys/inotify.h could switch from something like 
```
option(ENABLE_INOTIFY "Try to use inotify for directory monitoring" ON)
if(ENABLE_INOTIFY)
    include(CheckIncludeFiles)
    check_include_files(sys/inotify.h SYS_INOTIFY_H_FOUND)
    set(HAVE_SYS_INOTIFY_H ${SYS_INOTIFY_H_FOUND})
endif()
```
to 
```
option(ENABLE_INOTIFY "Try to use inotify for directory monitoring" ON)
if(ENABLE_INOTIFY) 
    find_package(Libinotify)
    set_package_properties(Libinotify PROPERTIES
                                                                  PURPOSE "Filesystem alteration notifications using inotify")
    set(HAVE_SYS_INOTIFY_H ${LIBINOTIFY_FOUND})
else()
set(HAVE_SYS_INOTIFY_H FALSE)
endif()
```
[from kcoreaddons], and append `${LIBINOTIFY_INCLUDE_DIRS}` to the `include_directories`, aswell as `${LIBINOTIFY_LIBRARIES}` to the link-libraires.


Diffs
-----

  find-modules/FindLibinotify.cmake PRE-CREATION 

Diff: https://git.reviewboard.kde.org/r/129316/diff/


Testing
-------

Used in the unofficial KDE FreeBSD ports.


Thanks,

Tobias Berner

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