Allow QTDIR to be defined either in pure windows format (c:\xyz\def) or unix format (/c/xyz/def) without ISS bailing out.

Previously, only unix format worked.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@19039 57a11ea4-9604-0410-9ed3-97b8803252fd

packaging/win32/dist.sh

@@ -235,7 +235,7 @@ function dist_gnucash() {
     cp -a $_INSTALL_UDIR/share/{gnucash,locale,xml} $DIST_UDIR/share
     cp -a $_REPOS_UDIR/packaging/win32/install-fq-mods.cmd $DIST_UDIR/bin
 
-    _QTDIR_WIN=`echo $QTDIR | sed 's,^/\([A-Za-z]\)/,\1:/,g' `
+    _QTDIR_WIN=$(unix_path $QTDIR | sed 's,^/\([A-Za-z]\)/,\1:/,g' )
     _AQBANKING_SO_EFFECTIVE=$(awk '/AQBANKING_SO_EFFECTIVE / { print $3 }' ${_AQBANKING_UDIR}/include/aqbanking/version.h )
     _GWENHYWFAR_SO_EFFECTIVE=$(awk '/GWENHYWFAR_SO_EFFECTIVE / { print $3 }' ${_GWENHYWFAR_UDIR}/include/gwenhywfar3/gwenhywfar/version.h )
     sed < $_BUILD_UDIR/packaging/win32/gnucash.iss \