Fixed cross-compile using mingw 64 bit under Windows 10 Linux subsystem (Ubunto 14.04)

Should work with true Ubuntu 14.04 as-is.

Makefile.in

@@ -70,7 +70,6 @@ dllib=@DLLIB@
 HOSTCC = @CC@
 HOSTCFLAGS = @WARNING_FLAGS@ @WARNING_FLAGS_CC@ @CFLAGS@
 
-CC = @CC@
 CXX = @CXX@
 DLLTOOL = @DLLTOOL@
 INSTALL = @INSTALL@
@@ -129,7 +128,7 @@ all: dep config.h _pli_types.h version_tag.h ivl@EXEEXT@ version.exe iverilog-vp
 ifeq (@MINGW32@,yes)
 all: dosify.exe
 dosify.exe: $(srcdir)/dosify.c
-	$(HOSTCC) $(HOSTCFLAGS) -o dosify.exe $(srcdir)/dosify.c
+	$(CC) $(CFLAGS) -o dosify.exe $(srcdir)/dosify.c
 endif
 
 # This rule rules the compiler in the trivial hello.vl program to make
@@ -239,7 +238,7 @@ iverilog-vpi: $(srcdir)/iverilog-vpi.sh Makefile
 endif
 
 version.exe: $(srcdir)/version.c $(srcdir)/version_base.h version_tag.h
-	$(HOSTCC) $(HOSTCFLAGS) -o version.exe -I. -I$(srcdir) $(srcdir)/version.c
+	$(CC) $(CFLAGS) -o version.exe -I. -I$(srcdir) $(srcdir)/version.c
 
 %.o: %.cc config.h
 	$(CXX) $(CPPFLAGS) $(CXXFLAGS) @DEPENDENCY_FLAG@ -c $< -o $*.o

aclocal.m4

@@ -225,6 +225,8 @@ AC_DEFUN([AX_C99_STRTOD],
 [# On MinGW we need to jump through hoops to get a C99 compliant strtod().
  # mingw-w64 doesn't need this, and the 64-bit version doesn't support it.
 case "${host}" in
+    x86_64-w64-mingw32)
+        ;;
     *-*-mingw32)
         LDFLAGS+=" -Wl,--undefined=___strtod,--wrap,strtod,--defsym,___wrap_strtod=___strtod"
         ;;

vvp/Makefile.in

@@ -35,7 +35,6 @@ includedir = @includedir@
 HOSTCC = @CC@
 HOSTCFLAGS = @WARNING_FLAGS@ @WARNING_FLAGS_CC@ @CFLAGS@
 
-CC = @CC@
 CXX = @CXX@
 DLLTOOL = @DLLTOOL@
 AR = @AR@
@@ -153,7 +152,7 @@ endif
 	mv $*.d dep/$*.d
 
 tables.cc: $(srcdir)/draw_tt.c
-	$(HOSTCC) $(HOSTCFLAGS) -o draw_tt.exe $(srcdir)/draw_tt.c
+	$(CC) $(CFLAGS) -o draw_tt.exe $(srcdir)/draw_tt.c
 	./draw_tt.exe > tables.cc
 	rm draw_tt.exe