fix a mingw64 build on Linux with --enable-tcc64-mingw

* define CONFIG_WIN64=yes when ARCH=x86-64 (not CONFIG_WIN32=yes)
    * CONFIG_WIN64 now use a windows install part (not a Linux one)

Makefile

@@ -271,10 +271,17 @@ else
 INSTALLBIN=$(INSTALL)
 endif
 
+ifdef CONFIG_WIN32
+CONFIG_WIN=yes
+endif
+ifdef CONFIG_WIN64
+CONFIG_WIN=yes
+endif
+
 install-strip: install
 	strip $(foreach PROG,$(PROGS),"$(bindir)"/$(PROG))
 
-ifndef CONFIG_WIN32
+ifndef CONFIG_WIN
 install: $(PROGS) $(TCCLIBS) $(TCCDOCS)
 	mkdir -p "$(bindir)"
 	$(INSTALLBIN) -m755 $(PROGS) "$(bindir)"

configure

@@ -520,9 +520,14 @@ if test "$noldl" = "yes" ; then
   echo "CONFIG_NOLDL=yes" >> config.mak
 fi
 if test "$mingw32" = "yes" ; then
+  if test "$cpu" = "x86-64"; then
+    echo "CONFIG_WIN64=yes" >> config.mak
+    echo "#define CONFIG_WIN64 1" >> $TMPH
+  else
     echo "CONFIG_WIN32=yes" >> config.mak
     echo "#define CONFIG_WIN32 1" >> $TMPH
   fi
+fi
 if test "$cygwin" = "yes" ; then
   echo "#ifndef _WIN32" >> $TMPH
   echo "# define _WIN32" >> $TMPH

lib/Makefile

@@ -68,7 +68,7 @@ else
 ifeq "$(TARGET)" "x86_64-win"
  OBJ = $(addprefix $(DIR)/,$(WIN64_O))
  TGT = -DTCC_TARGET_X86_64 -DTCC_TARGET_PE
- XCC = $(TCC) -B$(top_srcdir)/win32 -I$(top_srcdir)/include
+ XCC ?= $(TCC) -B$(top_srcdir)/win32 -I$(top_srcdir)/include
  XAR ?= $(DIR)/tiny_libmaker$(EXESUF)
  PICFLAGS =
 else