[PATCH] Rename V15_MINGW_HEADERS into CYGWIN_OLD_WINSOCK_HEADERS

["Torsten Bögershausen" <tboegi@web.de>]

See commit 380a4d927bff693c42fc6b22c3547bdcaac4bdc3:
"Update cygwin.c for new mingw-64 win32 api headers"
Cygwin up to 1.7.16 uses some header file from the WINE project
Cygwin 1.7.17 uses some header file from the mingw-64 project
As the old cygwin (like 1.5) never used mingw,
the name V15_MINGW_HEADERS is confusing.
Rename it into CYGWIN_OLD_WINSOCK_HEADERS

Addtional note:
Cygwin versions 1.7.1 up to 1.7.16 are expected to upgrade to 
Cygwin 1.7.17 or higher
As a temporary workaround make can be run as
CYGWIN_OLD_WINSOCK_HEADERS=Yes make


Signed-off-by: Torsten Bögershausen <tboegi@web.de>
---
 Makefile        | 6 +++---
 compat/cygwin.c | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index c3edf8c..c2ea735 100644
--- a/Makefile
+++ b/Makefile
@@ -1089,7 +1089,7 @@ ifeq ($(uname_O),Cygwin)
 		NO_SYMLINK_HEAD = YesPlease
 		NO_IPV6 = YesPlease
 		OLD_ICONV = UnfortunatelyYes
-		V15_MINGW_HEADERS = YesPlease
+		CYGWIN_OLD_WINSOCK_HEADERS = YesPlease
 	endif
 	NO_THREAD_SAFE_PREAD = YesPlease
 	NEEDS_LIBICONV = YesPlease
@@ -1901,8 +1901,8 @@ ifdef NO_REGEX
 	COMPAT_CFLAGS += -Icompat/regex
 	COMPAT_OBJS += compat/regex/regex.o
 endif
-ifdef V15_MINGW_HEADERS
-	COMPAT_CFLAGS += -DV15_MINGW_HEADERS
+ifdef CYGWIN_OLD_WINSOCK_HEADERS
+	COMPAT_CFLAGS += -DCYGWIN_OLD_WINSOCK_HEADERS
 endif
 
 ifdef USE_NED_ALLOCATOR
diff --git a/compat/cygwin.c b/compat/cygwin.c
index 59d86e4..b9f2862 100644
--- a/compat/cygwin.c
+++ b/compat/cygwin.c
@@ -1,5 +1,5 @@
 #define WIN32_LEAN_AND_MEAN
-#ifdef V15_MINGW_HEADERS
+#ifdef CYGWIN_OLD_WINSOCK_HEADERS
 #include "../git-compat-util.h"
 #include "win32.h"
 #else
-- 
1.7.12