depend on libapt-pkg in the libapt-inst build process

fixing parallel build in the handcrafted buildsystem is a pain,
so its not enabled by default, but its works for me – sometimes

Git-Dch: Ignore

apt-inst/makefile

@@ -18,6 +18,7 @@ MAJOR=1.5
 MINOR=0
 SLIBS=$(PTHREADLIB) -lapt-pkg
 APT_DOMAIN:=libapt-inst$(MAJOR)
+LIBRARYDEPENDS=$(LIB)/libapt-pkg.so
 
 # Source code for the contributed non-core things
 SOURCE = contrib/extracttar.cc contrib/arfile.cc

buildlib/library.mak

@@ -51,7 +51,7 @@ $(LIB)/lib$(LIBRARY).so: $(LIB)/lib$(LIBRARY).so.$(MAJOR).$(MINOR)
 	ln -sf $(<F) $@
 
 # The binary build rule
-$(LIB)/lib$(LIBRARY).so.$(MAJOR).$(MINOR): $($(LOCAL)-HEADERS) $($(LOCAL)-OBJS)
+$(LIB)/lib$(LIBRARY).so.$(MAJOR).$(MINOR): $($(LOCAL)-HEADERS) $($(LOCAL)-OBJS) $(LIBRARYDEPENDS)
 	-rm -f $(LIB)/lib$($(@F)-LIBRARY)*.so* 2> /dev/null
 	echo Building shared library $@
 	$(CXX) $(CXXFLAGS) $(LDFLAGS) $(PICFLAGS) $(LFLAGS) $(LFLAGS_SO)\
@@ -61,7 +61,7 @@ $(LIB)/lib$(LIBRARY).so.$(MAJOR).$(MINOR): $($(LOCAL)-HEADERS) $($(LOCAL)-OBJS)
 
 # Compilation rules
 vpath %.cc $(SUBDIRS)
-$(OBJ)/%.opic: %.cc
+$(OBJ)/%.opic: %.cc $(LIBRARYDEPENDS)
 	echo Compiling $< to $@
 	$(CXX) -c $(INLINEDEPFLAG) $(CPPFLAGS) $(CXXFLAGS) $(PICFLAGS) -o $@ $<
 	$(DoDep)