Fix MinGW make distclean and add <file>.in dependencies.

This patch fixes the crash in MinGW make distclean. The problem
was that vpi/ and driver-vpi/ were being called twice and the
MinGW make was failing on the second call since the Makefile
was already removed.

Add a dependency on config.h and _pli_types.h in the make all
target. It is likely that only _pli_types.h was needed, but
this makes it clear that they need to be rebuilt if the .in
files change.

The lower directories that depend on the top level config.status
now have a target to rebuild the local Makefile file it the
corresponding Makefile.in changes.

Makefile.in

@@ -82,7 +82,7 @@ CXXFLAGS = -Wall @CXXFLAGS@
 PICFLAGS = @PICFLAG@
 LDFLAGS = @rdynamic@ @LDFLAGS@
 
-all: dep version.h ivl@EXEEXT@
+all: dep config.h _pli_types.h version.h ivl@EXEEXT@
 	for dir in $(SUBDIRS); do (cd $$dir ; $(MAKE) VERSION=$(VERSION) $@); done
 	for dir in ivlpp ; \
 	    do (cd $$dir ; $(MAKE) VERSION=$(VERSION) $@); done
@@ -106,8 +106,11 @@ check: all
 
 clean:
 	for dir in $(SUBDIRS); do (cd $$dir ; $(MAKE) $@); done
-	for dir in vpi ivlpp tgt-verilog tgt-pal driver driver-vpi; \
+	for dir in ivlpp tgt-verilog tgt-pal driver; \
 	    do (cd $$dir ; $(MAKE) $@); done
+ifeq (@MINGW32@,no)
+	(cd driver-vpi ; $(MAKE) $@)
+endif
 	rm -f *.o parse.cc parse.cc.output parse.h lexor.cc
 	rm -f ivl.exp iverilog-vpi.pdf iverilog-vpi.ps parse.output
 	rm -f syn-rules.output dosify.exe ivl@EXEEXT@ check.vvp
@@ -116,8 +119,11 @@ clean:
 
 distclean: clean
 	for dir in $(SUBDIRS); do (cd $$dir ; $(MAKE) $@); done
-	for dir in vpi ivlpp tgt-verilog tgt-pal driver driver-vpi; \
+	for dir in ivlpp tgt-verilog tgt-pal driver; \
 	    do (cd $$dir ; $(MAKE) $@); done
+ifeq (@MINGW32@,no)
+	(cd driver-vpi ; $(MAKE) $@)
+endif
 	rm -f Makefile config.status config.log config.cache config.h
 	rm -f _pli_types.h
 
@@ -142,8 +148,14 @@ PExpr.o PGate.o PGenerate.o PScope.o PSpec.o \
 PTask.o PUdp.o PFunction.o PWire.o Statement.o AStatement.o StringHeap.o \
 $(FF) $(TT)
 
-Makefile: Makefile.in config.h.in config.status
-	./config.status
+Makefile: $(srcdir)/Makefile.in config.status
+	./config.status --file=$@
+
+config.h: $(srcdir)/config.h.in config.status
+	./config.status --header=$@
+
+_pli_types.h: $(srcdir)/_pli_types.h.in config.status
+	./config.status --header=$@
 
 
 ifeq (@WIN32@,yes)

driver-vpi/Makefile.in

@@ -58,6 +58,9 @@ clean:
 distclean: clean
 	rm -f Makefile
 
+Makefile: $(srcdir)/Makefile.in ../config.status
+	../config.status --file=$@
+
 O = main.o res.o
 
 iverilog-vpi@EXEEXT@: $O

driver/Makefile.in

@@ -57,6 +57,9 @@ clean:
 distclean: clean
 	rm -f Makefile
 
+Makefile: $(srcdir)/Makefile.in ../config.status
+	../config.status --file=$@
+
 O = main.o substit.o cflexor.o cfparse.o
 
 iverilog@EXEEXT@: $O

ivlpp/Makefile.in

@@ -51,6 +51,9 @@ clean:
 distclean: clean
 	rm -f Makefile
 
+Makefile: $(srcdir)/Makefile.in ../config.status
+	../config.status --file=$@
+
 O = main.o lexor.o
 
 ivlpp@EXEEXT@: $O

tgt-null/Makefile.in

@@ -71,6 +71,9 @@ clean:
 distclean: clean
 	rm -f Makefile config.status config.log config.cache
 
+Makefile: $(srcdir)/Makefile.in ../config.status
+	../config.status --file=$@
+
 check: all
 
 install: all installdirs $(libdir)/ivl$(suffix)/null.tgt $(INSTALL_DOC) $(libdir)/ivl$(suffix)/null.conf $(libdir)/ivl$(suffix)/null-s.conf

tgt-pal/Makefile.in

@@ -68,6 +68,9 @@ clean:
 distclean: clean
 	rm -f Makefile
 
+Makefile: $(srcdir)/Makefile.in ../config.status
+	../config.status --file=$@
+
 install: all installdirs $(libdir)/ivl/pal.tgt
 
 $(libdir)/ivl/pal.tgt: ./pal.tgt

tgt-verilog/Makefile.in

@@ -67,6 +67,9 @@ clean:
 distclean: clean
 	rm -f Makefile
 
+Makefile: $(srcdir)/Makefile.in ../config.status
+	../config.status --file=$@
+
 check: all
 
 install: all installdirs $(libdir)/ivl/verilog.tgt \