RTEMS | test_cat type mismatch with LTO (#5739)

[Joel Sherrill (@joel)]

Issue created by Joel Sherrill: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5739



## Summary
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@chris asked me to look into this. The patch to a solution is not clear. More below the output.

```
../../../testsuites/libtests/tar02/init.c:110:6: warning: type of 'test_cat' does not match original declaration [-Wlto-type-mismatch]
  110 | void test_cat( const char *file, int offset_arg, int length );
      |      ^
../../../testsuites/psxtests/psxfile01/test_cat.c:61:6: note: type mismatch in parameter 3
   61 | void test_cat( char *file, int offset_arg, size_t length )
      |      ^
../../../testsuites/psxtests/psxfile01/test_cat.c:61:6: note: type 'size_t' should match type 'int'
../../../testsuites/psxtests/psxfile01/test_cat.c:61:6: note: 'test_cat' was previously declared here
../../../testsuites/psxtests/psxfile01/test_cat.c:61:6: note: code may be misoptimized unless '-fno-strict-aliasing' is used
```

test_cat.c is in psxfile01 and included as "sources" in the yaml.
But tar02, psxftw01, psxftw02 are "scripts" in yaml. Those three reference test_cat.c in a custom script fragment.

## Steps to reproduce

@chris Beyond enabling LTO, what else?

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-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5739
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