vtk: fix generated cmake files to not reference C:/building (#1818)

see https://github.com/Alexpux/MINGW-packages/issues/1670

mingw-w64-vtk/PKGBUILD

@@ -5,7 +5,7 @@ _realname=vtk
 pkgbase="mingw-w64-${_realname}"
 pkgname="${MINGW_PACKAGE_PREFIX}-${_realname}"
 pkgver=7.0.0
-pkgrel=1
+pkgrel=2
 pkgdesc="A software system for 3D computer graphics, image processing and visualization (mingw-w64)"
 arch=('any')
 url="http://www.vtk.org/"
@@ -133,11 +133,13 @@ package() {
   cd "${srcdir}/build-${CARCH}"
   make -j1 DESTDIR="${pkgdir}" install
 
+  local PREFIX_DEPS=$(cygpath -am ${MINGW_PREFIX})
+
   pushd "${pkgdir}${MINGW_PREFIX}/lib/cmake/${_realname}-${pkgver%.*}" > /dev/null
   sed -s 's|Qt5::|Qt5|g' -i ./VTKTargets*.cmake
-  #sed -s "s|${PREFIX_DEPS}|\${_IMPORT_PREFIX}|g" -i ./VTKTargets.cmake
-  #find . -name '*.cmake' -exec \
-  #  sed -s "s|${PREFIX_DEPS}|\${VTK_INSTALL_PREFIX}|g" -i {} \;
+  sed -s "s|${PREFIX_DEPS}|\${_IMPORT_PREFIX}|g" -i ./VTKTargets.cmake
+  find . -name '*.cmake' -exec \
+    sed -s "s|${PREFIX_DEPS}|\${VTK_INSTALL_PREFIX}|g" -i {} \;
   popd > /dev/null
 
   install -Dm644 "${srcdir}/${_realname}-${pkgver}/Copyright.txt" \