lib/nfs/patches: disable the snprintf->sprintf_s alias

snprintf() is available on mingw, and the libnfs kludge broke the
build with mingw, because sprintf_s() was now both an inline function
and a "dllimport" function (because the macro renamed the inline
function snprintf() to sprintf_s() in mingw's stdio.h).

python/build/libs.py

@@ -429,6 +429,7 @@ libnfs = AutotoolsProject(
         '--disable-utils', '--disable-examples',
     ],
     base='libnfs-libnfs-4.0.0',
+    patches='src/lib/nfs/patches',
     autoreconf=True,
 )
 

src/lib/nfs/patches/no_sprintf_s

@@ -0,0 +1,14 @@
+Index: libnfs-libnfs-4.0.0/include/win32/win32_compat.h
+===================================================================
+--- libnfs-libnfs-4.0.0.orig/include/win32/win32_compat.h
++++ libnfs-libnfs-4.0.0/include/win32/win32_compat.h
+@@ -133,7 +133,9 @@ struct pollfd {
+ 
+ /* Wrapper macros to call misc. functions win32 is missing */
+ #define poll(x, y, z)        win32_poll(x, y, z)
++#ifndef __MINGW32__
+ #define snprintf             sprintf_s
++#endif
+ #define inet_pton(x,y,z)     win32_inet_pton(x,y,z)
+ #define open(x, y, z)        _open(x, y, z)
+ #ifndef lseek

src/lib/nfs/patches/series

@@ -0,0 +1 @@
+no_sprintf_s