• Update `lang/gauche' to version 0.9.7
• Fix two tests that are failing on FreeBSD: one because clang aborts due to failed assertion when trying to compile ``extern void sin(); sin();'':
  
  Assertion failed: (Arg < NumArgs && "Arg access out of range!"), function getArg, file /usr/src/contrib/llvm/tools/clang/include/clang/AST/Expr.h, line 2283. cc: error: unable to execute command: Abort trap (core dumped)
  
  Another test (cf-check-lib) fails because of the LIBS variable which is passed on the TEST_ENV list. Since there's nothing useful to the tests there anyway, just ensure it is empty

PR: 234257