Correct a typo.  linux != linus.

e_os2.h

diff --git a/e_os2.h b/e_os2.h
index ed90f22..1b71fba 100644
--- a/e_os2.h
+++ b/e_os2.h
@@ -141,7 +141,7 @@
 
 /* --------------------------------- Unix ---------------------------------- */
 #ifdef OPENSSL_SYS_UNIX
-# if defined(linus) || defined(OPENSSL_SYSNAME_LINUX)
+# if defined(linux) || defined(OPENSSL_SYSNAME_LINUX)
 #  define OPENSSL_SYS_LINUX
 # endif
 # ifdef OPENSSL_SYSNAME_MPE