fix to have erlang Install.exe run silently
diff --git a/bin/erl_build.sh b/bin/erl_build.sh
index c951516..f1a0c38 100644
--- a/bin/erl_build.sh
+++ b/bin/erl_build.sh
@@ -1,6 +1,6 @@
#!/bin/sh
./otp_build boot -a | tee $ERL_TOP/build_boot.txt
./otp_build release -a | tee $ERL_TOP/build_release.txt
-./release/win32/Install.exe | tee -a $ERL_TOP/build_release.txt
+./release/win32/Install.exe /s | tee -a $ERL_TOP/build_release.txt
./otp_build installer_win32 | tee $ERL_TOP/build_installer_win32.txt
mv --force $ERL_TOP/release/win32/otp_win32_R*.exe /relax/built/ | tee -a $ERL_TOP/build_installer_win32.txt
