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[devurandom <1892420@xxxxxxxxxxxxxxxxxx>]

Upstream further explained that
/usr/share/cmake/Modules/FindLAPACK.cmake should actually search (and
make the application link against) both LAPACK and BLAS.  For some
reason this does not happen on my system / Gentoo.  I am investigating.

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https://bugs.launchpad.net/bugs/1892420

Title:
  levmar uses BLAS when built with LAPACK, but Hugin does not link
  against BLAS

Status in Hugin:
  Invalid
Status in hugin package in Gentoo Linux:
  New

Bug description:
  ```
  hugin-2019.2.0/src/foreign/levmar/misc_core.c:45:#define GEMM LM_MK_BLAS_NAME(gemm)
  ```

  This function is a BLAS function:
  https://en.wikipedia.org/wiki/Basic_Linear_Algebra_Subprograms#Level_3

  Thus, since levmar is built as a static library, Hugin itself should
  call `find_package(BLAS)` and `huginbase` should link against
  `BLAS_LIBRARIES`.

  Attached patch fixes this (in an admittedly slightly crude way) for
  me.

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