patch 7.4.713
Problem:    Wrong condition for #ifdef.
Solution:   Change USR_EXRC_FILE2 to USR_VIMRC_FILE2. (Mikael Fourrier)
diff --git a/src/os_unix.h b/src/os_unix.h
index 4220534..5fc95ee 100644
--- a/src/os_unix.h
+++ b/src/os_unix.h
@@ -290,7 +290,7 @@
 #endif
 
 
-#if !defined(USR_EXRC_FILE2)
+#if !defined(USR_VIMRC_FILE2)
 # ifdef OS2
 #  define USR_VIMRC_FILE2	"$HOME/vimfiles/vimrc"
 # else