Add header for special C defines.

include/ldap_cdefs.h

+/* LDAP C Defines */
+
+#ifndef _LDAP_CDEFS_H
+#define _LDAP_CDEFS_H
+
+#if defined(__cplusplus)
+#	define LDAP_BEGIN_DECL	extern "C" {
+#	define LDAP_END_DECL	}
+#else
+#	define LDAP_BEGIN_DECL
+#	define LDAP_END_DECL	
+#endif
+
+#if defined(__STDC__) || defined(__cplusplus)
+	/* ANSI C or C++ */
+#	define LDAP_P(protos)	protos
+#	define LDAP_CONCAT1(x,y)	x ## y
+#	define LDAP_CONCAT(x,y)	LDAP_CONCAT1(x,y)
+#	define LDAP_STRING(x)	#x /* stringify without expanding x */
+#	define LDAP_XSTRING(x)	LDAP_STRING(x) /* expand x, then stringify */
+#else /* ! __STDC__ && ! __cplusplus */
+	/* traditional C */
+#	define LDAP_P(protos)	()
+#	define LDAP_CONCAT(x,y)	x/**/y
+#	define LDAP_STRING(x)	"x"
+#endif /* __STDC__ || __cplusplus */
+
+#ifndef LDAP_F
+#	ifdef _WIN32
+#		define LDAP_F	__declspec( dllexport )
+#	else /* ! _WIN32 */
+#		define LDAP_F	extern
+#	endif /* _WIN32 */
+#endif /* LDAP_FDECL */
+
+#endif /* _LDAP_CDEFS_H */