Mark one inline symbol as optional to fix build on Ubuntu ppc64el.

debian/changelog

@@ -3,6 +3,7 @@ qt6-base (6.2.4+dfsg-8) UNRELEASED; urgency=medium
   [ Dmitry Shachnev ]
   * Disable relocatable feature, to fix paths on usr-merged systems.
     Thanks to Steven Trabert for the patch! (Closes: #1010575, LP: #1970057)
+  * Mark one inline symbol as optional to fix build on Ubuntu ppc64el.
 
  -- Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>  Sun, 15 May 2022 17:48:31 +0300
 

debian/libqt6core6.symbols

@@ -1158,7 +1158,7 @@ libQt6Core.so.6 libqt6core6 #MINVER#
  (subst)_ZN17QCborStreamReader7addDataEPKc{qptrdiff}@Qt_6 6.1.2
  _ZN17QCborStreamReader7addDataERK10QByteArray@Qt_6 6.1.2
  _ZN17QCborStreamReader7reparseEv@Qt_6 6.1.2
- _ZN17QCborStreamReader8preparseEv@Qt_6 6.1.2
+ (optional=inline)_ZN17QCborStreamReader8preparseEv@Qt_6 6.1.2
  _ZN17QCborStreamReader9lastErrorEv@Qt_6 6.1.2
  _ZN17QCborStreamReader9setDeviceEP9QIODevice@Qt_6 6.1.2
  _ZN17QCborStreamReaderC1EP9QIODevice@Qt_6 6.1.2