ci: make sure we fail the build and pass on the non zero exit code

So far we just kept going on when one of the make targets failed with
the next one.

.ci/ci-linux-build.sh

@@ -1,5 +1,7 @@
 #!/bin/sh
 
+set -e
+
 PARALLEL_JOBS=10
 
 CI_BUILD_TYPE=$1

.ci/ci-osx-build.sh

@@ -1,5 +1,7 @@
 #!/bin/sh
 
+set -e
+
 COPTS="--with-crypto=none --disable-pulseaudio --disable-cxx-bindings"
 PARALLEL_JOBS=10