[Fortran, Patch] PR36462 - fix INDEX/SCAN with KIND= and not BACK= argument

[Tobias Burnus]

The library versions of INDEX/SCAN library functions take as argument 
only the two strings and then a logical for BACK=.

However, in the FE the value of the third (present) argument was passed, 
which was the kind value if BACK= was not present.

Build and lightly tested. (I will do a full check-gfortran later.)
OK when the test succeeds?

Tobias
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