* Fix build for ming-w64

doc/windows

@@ -31,6 +31,10 @@ Crosscompilation
   make w32dist
 
 
+Windows x86-64
+==============
+  ./configure --without-gmp --with-compiler=x86_64-w64-mingw32-gcc --with-ostype=windows --host=x86_64-unknown-windows --without-magic --without-ssl
+
 
 Python bindings:
 ================

libr/io/p/io_w32dbg.c

@@ -24,7 +24,7 @@ extern int errno;
 
 static int debug_os_read_at(RIOW32Dbg *dbg, void *buf, int len, ut64 addr) {
 	DWORD ret;
-        ReadProcessMemory (dbg->pi.hProcess, (PCVOID)(ULONG)addr, buf, len, &ret);
+        ReadProcessMemory (dbg->pi.hProcess, (void*)(size_t)addr, buf, len, &ret);
 //	if (len != ret)
 //		eprintf ("Cannot read 0x%08llx\n", addr);
 	return len; // XXX: Handle read correctly and not break r2 shell

mk/x86_64-w64-mingw32-gcc.mk

@@ -0,0 +1,17 @@
+CC=x86_64-w64-mingw32-gcc
+RANLIB=x86_64-w64-mingw32-ranlib
+ONELIB=0
+OSTYPE=windows
+LINK=
+CC_AR=echo ar -r ${LIBAR}
+PICFLAGS=
+CFLAGS+=${PICFLAGS} -MD -D__WINDOWS__=1
+CC_LIB=${CC} -shared -o
+CFLAGS_INCLUDE=-I
+LDFLAGS_LINK=-l
+LDFLAGS_LINKPATH=-L
+CFLAGS_OPT0=-O0
+CFLAGS_OPT1=-O1
+CFLAGS_OPT2=-O2
+CFLAGS_OPT3=-O3
+CFLAGS_DEBUG=-g