Bug fix suggestion

[Dave Brown]

I have not reported this as I have never done something like this but a
suggestion to fix build fail when libqtav is installed but not found.


Linux acer-laptop 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:34:49 UTC
2016 i686 i686 i686 GNU/Linux

dpkg -l libqtav
Desired=Unknown/Install/Remove/Purge/Hold
|
Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                      Version           Architecture
 Description
+++-=========================-=================-=================-=======================================================
ii  libqtav:i386              1.11.0~git170108- i386              QtAV
library


----------------------------------------------------------------------------------------------------------------------

if (NOT APPLE)
    find_path(QTAV_CORE_INCLUDE_DIR
              NAMES QtAV.h
              HINTS ${_qt5_install_prefix}
          # For MXE
                    ${_qt5_install_prefix}/../qt5/include
         # For Mageia
                    ${_qt5_install_prefix}/../../include/qt5
          # For Suse

${_qt5_install_prefix}/../../../include/x86_64-linux-gnu/qt5     # For
Debian
*++ ${_qt5_install_prefix}/../../../include/i386-linux-gnu/qt5 # For Mint32
(possibly all 32 Debian)*
             PATH_SUFFIXES QtAV
    )

    find_path(QTAV_WIDGETS_INCLUDE_DIR
              NAMES QtAVWidgets.h
              HINTS ${_qt5_install_prefix}
          # For MXE
                    ${_qt5_install_prefix}/../qt5/include
         # For Mageia
                    ${_qt5_install_prefix}/../../include/qt5
          # For Suse

${_qt5_install_prefix}/../../../include/x86_64-linux-gnu/qt5     # For
Debian
*++
 ${_qt5_install_prefix}/../../../include/i386-linux-gnu/qt5 # For Mint32
(possibly all 32 Debian)*
              PATH_SUFFIXES QtAVWidgets
    )


Dave Brown
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