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travis: print cppcheck's output to stdout

This prevents Travis from believing that an error has occurred after
10 minutes without output. Capture error messages in a file and print
its content after cppcheck has finished.

Exit the script with cppcheck's exit code.

Thanks @turol for your help with this!

--- a/.travis.sh

+++ b/.travis.sh

@@ -1,8 +1,14 @@

 #!/bin/sh

-set -e

 if [ "$ANALYZE" = "true" ] ; then

-	cppcheck --error-exitcode=1 -j2 -UTESTING -Iopl -Isrc -Isrc/setup opl pcsound src textscreen > /dev/null

+	cppcheck --error-exitcode=1 -j2 -UTESTING -Iopl -Isrc -Isrc/setup opl pcsound src textscreen 2> stderr.txt

+	RET=$?

+	if [ -s stderr.txt ]

+	then

+		cat stderr.txt

+	fi

+	exit $RET

 else

+	set -e

 	./autogen.sh --enable-werror

 	make

 	make install DESTDIR=/tmp/whatever