D16893: appimage: Do not bundle libfontconfig

[Kevin Funk]

kfunk created this revision.
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REVISION SUMMARY
  The bundled libfontconfig seems to cause problems when the target system uses
  a newer font config format. See discussion here:
  
    https://mail.kde.org/pipermail/kdevelop/2018-October/019726.html
  
  It seems to be a common problem (as seen in bug reports of other AppImage
  projects).
  
  It's also blacklisted in linuxdeployqt:
  
    https://github.com/AppImage/AppImages/blob/master/excludelist
  
  For me locally, after the change I also have the exact same font appearance
  as with native applications. Before the patch the fonts did use my
  anti-aliasing settings iiuc. Before the patch, running the AppImage resulted
  in lots of warnings:
  
    Fontconfig warning: line 5: unknown element "its:rules"
    Fontconfig warning: line 6: unknown element "its:translateRule"
    Fontconfig warning: line 9: unknown element "description"
    Fontconfig warning: "/etc/fonts/conf.d/10-hinting-slight.conf", line 4: unknown element "its:rules"
    Fontconfig warning: "/etc/fonts/conf.d/10-hinting-slight.conf", line 5: unknown element "its:translateRule"
    Fontconfig warning: "/etc/fonts/conf.d/10-hinting-slight.conf", line 8: unknown element "description"
    ...
  
  ... these warnings are now gone.
  
  Thanks for the analysis by Friedrich.
  
  Actually easy to test using the new AppImage format. Just do:
  
    ./KDevelop-5.3.0-x86_64.AppImage --appimage-extract
    cd squashfs-root
    ./AppRun # to check appearance before
    rm rm usr/lib/libfontconfig.so.1
    ./AppRun # to check appearance after rm'ing the lib

REPOSITORY
  R32 KDevelop

BRANCH
  5.3

REVISION DETAIL
  https://phabricator.kde.org/D16893

AFFECTED FILES
  appimage/kdevelop-recipe-centos6.sh

To: kfunk
Cc: kdevelop-devel, glebaccon, antismap, iodelay, vbspam, geetamc, Pilzschaf, akshaydeo, surgenight, arrowd
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