[PATCH] Fix preprocessor logic that determines the availablity of strchrnul().

[Johannes Sixt <j.sixt@viscovery.net>]

Apart from the error in the condition (&& should actually be ||), the
construct

    #if !defined(A) || !A

leads to a syntax error in the C preprocessor if A is indeed not defined.

Tested-by: David Symonds <dsymonds@gmail.com>
Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
---
  git-compat-util.h |    8 +++++++-
  1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/git-compat-util.h b/git-compat-util.h
index 3d147b6..276a437 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -184,7 +184,13 @@ void *gitmemmem(const void *haystack, size_t haystacklen,
                  const void *needle, size_t needlelen);
  #endif

-#if !defined(__GLIBC_PREREQ) && !__GLIBC_PREREQ(2, 1)
+#ifdef __GLIBC_PREREQ
+#if __GLIBC_PREREQ(2, 1)
+#define HAVE_STRCHRNUL
+#endif
+#endif
+
+#ifndef HAVE_STRCHRNUL
  #define strchrnul gitstrchrnul
  static inline char *gitstrchrnul(const char *s, int c)
  {
-- 
1.5.3.5.578.g1f8ec