Attempt to fix Mono weekly in travis (once again)

mono_envsetup.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+
+MONO_DEBUG_IF_AVAILABLE() {
+	local PREVIOUS_MONO_DEBUG="$MONO_DEBUG"
+
+	# Add change if needed
+	if [[ -z "$PREVIOUS_MONO_DEBUG" ]]; then
+		export MONO_DEBUG="$1"
+	elif echo "$PREVIOUS_MONO_DEBUG" | grep -Fq "$1"; then
+		return 0
+	else
+		export MONO_DEBUG="${PREVIOUS_MONO_DEBUG},${1}"
+	fi
+
+	# If we did a change, check if Mono supports that option
+	# If not, it will be listed as invalid option on line 1
+	if mono "" 2>&1 | head -n 1 | grep -Fq "$1"; then
+		export MONO_DEBUG="$PREVIOUS_MONO_DEBUG"
+		return 1
+	fi
+
+	return 0
+}
+
+VERSION_GREATER() {
+	if [[ "$1" = "$2" ]]; then
+		return 1
+	fi
+
+	! VERSION_LESS_EQUAL "$1" "$2"
+}
+
+VERSION_GREATER_EQUAL() {
+	! VERSION_LESS "$1" "$2"
+}
+
+VERSION_LESS() {
+	if [[ "$1" = "$2" ]]; then
+		return 1
+	fi
+
+	VERSION_LESS_EQUAL "$1" "$2"
+}
+
+VERSION_LESS_EQUAL() {
+	[[  "$1" = "$(echo -e "$1\n$2" | sort -V | head -n 1)" ]]
+}
+
+
+MONO_VERSION="$(mono -V | head -n 1 | cut -d ' ' -f 5)"
+
+if VERSION_GREATER_EQUAL "$MONO_VERSION" "4.6.0"; then
+	MONO_DEBUG_IF_AVAILABLE "no-compact-seq-points"
+fi