Fix build

Failing like

  ThemeImportExportTest.o : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class Color const & __cdecl SvxBrushItem::GetColor(void)const " (__imp_?GetColor@SvxBrushItem@@QEBAAEBVColor@@xz) referenced in function "public: void __cdecl testCellBackgroundThemeColor::TestBody(void)" (?TestBody@testCellBackgroundThemeColor@@QEAAXXZ)
  ThemeImportExportTest.o : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class model::ComplexColor const & __cdecl SvxBrushItem::getComplexColor(void)const " (__imp_?getComplexColor@SvxBrushItem@@QEBAAEBVComplexColor@model@@xz) referenced in function "public: void __cdecl testCellBackgroundThemeColor::TestBody(void)" (?TestBody@testCellBackgroundThemeColor@@QEAAXXZ)
  C:\lo\src\build\workdir\LinkTarget\CppunitTest\test_sc_theme_import_export_test.dll : fatal error LNK1120: 2 unresolved externals

Change-Id: I7a64405e3e8bf774163d8f101681c2c0de892767
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/153736
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <[email protected]>

Author: mikekaganski

sc/CppunitTest_sc_theme_import_export_test.mk

@@ -29,6 +29,7 @@ $(eval $(call gb_CppunitTest_use_libraries,sc_theme_import_export_test, \
     comphelper \
     cppu \
     cppuhelper \
+    editeng \
     sal \
     salhelper \
     sax \