[Instantiate] ensure newline termination and distribute test files

src/plugins/instantiate/Makefile.in

src/plugins/instantiate/tests/options/test_config

src/plugins/instantiate/tests/plugin/ast_clear.c

src/plugins/instantiate/tests/plugin/function_pointers.i

src/plugins/instantiate/tests/stdlib/calloc.c

src/plugins/instantiate/tests/stdlib/free.c

src/plugins/instantiate/tests/stdlib/malloc.c