patch 8.2.0320: no Haiku support

Problem:    No Haiku support.
Solution:   Add support for Haiku. (Emir Sari, closes #5605)
diff --git a/src/INSTALL b/src/INSTALL
index 3da9141..a404833 100644
--- a/src/INSTALL
+++ b/src/INSTALL
@@ -16,7 +16,7 @@
 See INSTALLx.txt		for cross-compiling on Unix
 See ../READMEdir/README_390.txt for z/OS and OS/390 Unix
 See ../runtime/doc/os_beos.txt  for BeBox
-
+See ../runtime/doc/os_haiku.txt	for Haiku
 
 1. Generic
 ==========