emscripten-buildbot.sh: exit with an error if configure/make fail.

build-scripts/emscripten-buildbot.sh

@@ -51,13 +51,14 @@ mkdir buildbot
 pushd buildbot
 
 echo "Configuring..."
-emconfigure ../configure --host=asmjs-unknown-emscripten --disable-assembly --disable-threads --enable-cpuinfo=false CFLAGS="-O2 -Wno-warn-absolute-paths -Wdeclaration-after-statement -Werror=declaration-after-statement" --prefix="$PWD/emscripten-sdl2-installed"
+emconfigure ../configure --host=asmjs-unknown-emscripten --disable-assembly --disable-threads --enable-cpuinfo=false CFLAGS="-O2 -Wno-warn-absolute-paths -Wdeclaration-after-statement -Werror=declaration-after-statement" --prefix="$PWD/emscripten-sdl2-installed" || exit $?
 
 echo "Building..."
-emmake $MAKE
+emmake $MAKE || exit $?
 
 echo "Moving things around..."
-emmake $MAKE install
+emmake $MAKE install || exit $?
+
 # Fix up a few things to a real install path
 perl -w -pi -e "s#$PWD/emscripten-sdl2-installed#/usr/local#g;" ./emscripten-sdl2-installed/lib/libSDL2.la ./emscripten-sdl2-installed/lib/pkgconfig/sdl2.pc ./emscripten-sdl2-installed/bin/sdl2-config
 mkdir -p ./usr