Make script executable.

travis_instll_libs.sh

-#!/bin/sh
-set -ex
-installLib() {
-	wget https://github.com/libyal/$1/releases/download/$2/$1-alpha-$2.tar.gz
-	tar -xzf $1-alpha-$2.tar.gz
-	cd $1-$2
-	if test ${TRAVIS_OS_NAME} = "linux"; then
-		./configure -prefix=/usr > /dev/null
-	else
-		./configure > /dev/null
-	fi
-	make > /dev/null && sudo make install > /dev/null
-	cd ..
-}
-
-installLib libvhdi 20181227
-installLib libvmdk 20181227
-