patch 8.2.0622: Haiku: GUI does not compile

Problem:    Haiku: GUI does not compile.
Solution:   Various fixes. (Emir Sari, closes #5961)
diff --git a/Filelist b/Filelist
index 422a0d0..581a72d 100644
--- a/Filelist
+++ b/Filelist
@@ -607,6 +607,7 @@
 
 # source files for Haiku (also in the extra archive)
 SRC_HAIKU =	\
+		README_haiku.txt \
 		src/os_haiku.h \
 		src/os_haiku.rdef \
 		src/gui_haiku.cc \