#12778, patch 07/17: fix a series of warnings from clang

git-svn-id: file:///svn/Scribus/trunk/Scribus@19597 11d20701-8431-0410-a711-e3c959e3b870
#12778, patch 10/17: fix a series of warnings from clang

git-svn-id: file:///svn/Scribus/trunk/Scribus@19598 11d20701-8431-0410-a711-e3c959e3b870