Merge branch 'rj/cygwin-fread-reads-directories'

It turns out that Cygwin also needs the fopen() wrapper that
returns failure when a directory is opened for reading.

* rj/cygwin-fread-reads-directories:
  config.mak.uname: set FREAD_READS_DIRECTORIES for cygwin

Author: gitster

config.mak.uname

@@ -185,6 +185,7 @@ ifeq ($(uname_O),Cygwin)
 	SPARSE_FLAGS = -isystem /usr/include/w32api -Wno-one-bit-signed-bitfield
 	OBJECT_CREATION_USES_RENAMES = UnfortunatelyNeedsTo
 	COMPAT_OBJS += compat/cygwin.o
+	FREAD_READS_DIRECTORIES = UnfortunatelyYes
 endif
 ifeq ($(uname_S),FreeBSD)
 	NEEDS_LIBICONV = YesPlease