Generalise the definition of strcasecmp() and strncasecmp() for
platforms that don't (necessarely) have it.  In the case of VMS, this
means moving a couple of functions from apps/ to crypto/ and make them
general (although only used privately).

e_os.h

diff --git a/e_os.h b/e_os.h
index 3800bfd..3f7cdf4 100644
--- a/e_os.h
+++ b/e_os.h
@@ -503,11 +503,30 @@
 #define IRIX_CC_BUG	/* CDS++ up to V2.0Bsomething suffered from the same bug.*/
 #endif
 
+#if defined(OPENSSL_SYS_WINDOWS)
+#  define strcasecmp _stricmp
+#  define strncasecmp _strnicmp
+#elif defined(OPENSSL_SYS_VMS)
+/* VMS below version 7.0 doesn't have strcasecmp() */
+#  include <openssl/o_str.h>
+#  define strcasecmp OPENSSL_strcasecmp
+#  define strncasecmp OPENSSL_strncasecmp
+#elif defined(OPENSSL_SYS_OS2) && defined(__EMX__)
+#  define strcasecmp stricmp
+#  define strncasecmp strnicmp
+#else
+#  ifdef NO_STRINGS_H
+    int	strcasecmp();
+    int	strncasecmp();
+#  else
+#    include <strings.h>
+#  endif /* NO_STRINGS_H */
+#endif
+
 #if defined(OPENSSL_SYS_OS2) && defined(__EMX__)
 # include <io.h>
 # include <fcntl.h>
 # define NO_SYSLOG
-# define strcasecmp stricmp
 #endif
 
 /* vxworks */