Add expint benchmark.

	* Makefile.am: Add src/expint to SUBDIRS
	* Makefile.in: Regenerate
	* analysis/simulator.in: Add expint
	* configure: Regenerate
	* configure.ac: Add src/expint/Makefile to AC_CONFIG_FILES
	* src/expint/Makefile.am: Create Makefile.am from template
	* src/expint/Makefile.in: Regenerate
	* src/expint/expint.c: Import expint benchmark from WCET.