makedep: Add support for reading source variables directly from the makefile.

Make.rules.in

@@ -75,12 +75,8 @@ $(IMPORTLIB:%=lib%.cross.a): $(MAINSPEC) $(IMPLIB_SRCS:.c=.cross.o)
 
 # Rules for dependencies
 
-DEPEND_SRCS = $(C_SRCS) $(OBJC_SRCS) $(RC_SRCS) $(MC_SRCS) \
-              $(IDL_H_SRCS) $(IDL_C_SRCS) $(IDL_I_SRCS) $(IDL_P_SRCS) $(IDL_S_SRCS) $(IDL_R_SRCS) $(IDL_TLB_SRCS) \
-              $(BISON_SRCS) $(LEX_SRCS) $(XTEMPLATE_SRCS) $(IN_SRCS) $(EXTRA_OBJS) $(MANPAGES)
-
 depend: dummy
-	$(MAKEDEP) $(MAKEDEPFLAGS) -C$(srcdir) -S$(top_srcdir) -T$(top_builddir) $(PARENTSRC:%=-P%) $(EXTRAINCL) $(DEPEND_SRCS)
+	$(MAKEDEP) -M .
 
 .PHONY: depend
 

aclocal.m4

@@ -238,11 +238,11 @@ wine_fn_depend_rules ()
 
     wine_fn_append_rule \
 "$ac_dir/Makefile: $srcdir/$ac_dir/Makefile.in $srcdir/Make.vars.in config.status $ac_alldeps \$(MAKEDEP)
-	@./config.status --file $ac_dir/Makefile:$ac_input && cd $ac_dir && \$(MAKE) depend
+	@./config.status --file $ac_dir/Makefile:$ac_input && \$(MAKEDEP) -M $ac_dir
 depend: $ac_dir/depend
 .PHONY: $ac_dir/depend
 $ac_dir/depend: $ac_makedep dummy
-	@./config.status --file $ac_dir/Makefile:$ac_input && cd $ac_dir && \$(MAKE) depend"
+	@./config.status --file $ac_dir/Makefile:$ac_input && \$(MAKEDEP) -M $ac_dir"
 }
 
 wine_fn_pot_rules ()

configure

@@ -7184,11 +7184,11 @@ wine_fn_depend_rules ()
 
     wine_fn_append_rule \
 "$ac_dir/Makefile: $srcdir/$ac_dir/Makefile.in $srcdir/Make.vars.in config.status $ac_alldeps \$(MAKEDEP)
-	@./config.status --file $ac_dir/Makefile:$ac_input && cd $ac_dir && \$(MAKE) depend
+	@./config.status --file $ac_dir/Makefile:$ac_input && \$(MAKEDEP) -M $ac_dir
 depend: $ac_dir/depend
 .PHONY: $ac_dir/depend
 $ac_dir/depend: $ac_makedep dummy
-	@./config.status --file $ac_dir/Makefile:$ac_input && cd $ac_dir && \$(MAKE) depend"
+	@./config.status --file $ac_dir/Makefile:$ac_input && \$(MAKEDEP) -M $ac_dir"
 }
 
 wine_fn_pot_rules ()