fix compilation with cygwin

VisualNaCro/Makefile.am

@@ -4,7 +4,7 @@ OBJS=nacro.o
 ISRCS=nacro_wrap.c
 IOBJS=nacro_wrap.o
 TARGET=nacro
-LIBS= @LIBVNCSERVERLIBS@ -lvncclient
+LIBS= -lvncclient @LIBVNCSERVERLIBS@
 
 nacro_CFLAGS= @LIBVNCSERVERCFLAGS@
 

VisualNaCro/configure.ac

@@ -62,7 +62,7 @@ then
 	*-*-aix*) LDSHARED="\$(srcdir)/ld_so_aix \$(CC)";;
 	*-*-cygwin* | *-*-mingw*)
             if test "$GCC" = yes; then
-                LDSHARED="$CC -shared"
+                LDSHARED="dllwrap --driver-name gcc --dlltool dlltool --export-all-symbols --as as --dllname \$(LIBPREFIX)\$(TARGET)\$(SO)"
             else
                 if test "cl" = $CC ;  then
                     # Microsoft Visual C++ (MSVC)