tests for fork/strchr/strcpy/strncpy/strlen/fsync/getpid are missing in run-posix-option-group-test.sh

[woqidaideshi]

The following tests are not covered by run-posix-option-group-test.sh.

• testcases/open_posix_testsuite/conformance/interfaces/fork
• testcases/open_posix_testsuite/conformance/interfaces/strchr
• testcases/open_posix_testsuite/conformance/interfaces/strcpy
• testcases/open_posix_testsuite/conformance/interfaces/strncpy
• testcases/open_posix_testsuite/conformance/interfaces/strlen
• testcases/open_posix_testsuite/conformance/interfaces/fsync
• testcases/open_posix_testsuite/conformance/interfaces/getpid

We need to add the tests for the POSIX areas specified by the 3-letter tags in the POSIX specification. It is necessary to ensure that the newly added tests can also be covered in run-posix-option-group-test.sh.