Fix part accidentally removed with Borland things.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 2473bb8e30)

siputils.py

@@ -1511,6 +1511,8 @@ class ProgramMakefile(Makefile):
 
         build.extend(self.optional_list("CXXFLAGS"))
 
+        build.append(source)
+
         if self.generator in ("MSVC", "MSVC.NET"):
             build.append("-Fe")
             build.append("/link")