Use Ptr{BlasInt} for info in LAPACK_RFP module

[dmbates]

As described in #2

[codecov]

Codecov Report

Base: 92.51% // Head: 92.51% // No change to project coverage 👍

Coverage data is based on head (3fe0deb) compared to base (7d7a0ec).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #4   +/-   ##
=======================================
  Coverage   92.51%   92.51%           
=======================================
  Files           2        2           
  Lines         147      147           
=======================================
  Hits          136      136           
  Misses         11       11           

Impacted Files	Coverage Δ
src/lapack.jl	95.52% <100.00%> (ø)

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