add local srcdir to perl5lib env var

Dependencies

• [2] WHS5RMPO
• [*] G2ZB6464 first test, not yet in buildprocess

Change contents

• edit in tests/Makefile.am at line 9
  [2.291]

  [2.291]
  + PERL5LIB=$$PERL5LIB:$(top_srcdir)/src/lib \