Add static build.

.github/travis/before-install.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+if [ "$TRAVIS_OS_NAME" = "linux" ]; then
+	sudo apt-get update -qq
+	sudo apt-get -y install bison \
+			        autotools-dev \
+				libncurses5-dev \
+				libevent-dev \
+				pkg-config \
+				libutempter-dev \
+				build-essential
+fi

.github/travis/build.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+sh autogen.sh || exit 1
+if [ "$BUILD" = "static" ]; then
+	./configure --enable-static || exit 1
+else
+	./configure || exit 1
+fi
+exec make