tests: skip fseek/ftell tests if ungetc is broken * m4/ungetc.m4: New file. * modules/fseek-tests: Split test, so ungetc dependency is separate from rest of test. * modules/fseeko-tests: Likewise. * modules/ftell-tests: Likewise. * modules/ftello-tests: Likewise. * tests/test-fseek.c (main): Isolate ungetc dependency. * tests/test-fseeko.c (main): Likewise. * tests/test-ftell.c (main): Likewise. * tests/test-ftello.c (main): Likewise. * tests/test-fseek2.sh: New file. * tests/test-fseeko2.sh: Likewise. * tests/test-ftell2.sh: Likewise. * tests/test-ftello2.sh: Likewise.

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