community/arpack: enable build on ppc64le

Enable build on ppc64le as openblas is available.

community/arpack/APKBUILD

@@ -6,7 +6,7 @@ pkgver=3.5.0
 pkgrel=0
 pkgdesc="Collection of Fortran77 subroutines designed to solve large scale eigenvalue problems"
 url="https://github.com/opencollab/arpack-ng"
-arch="all !ppc64le !s390x" #openblas not avail on excluded platform
+arch="all !s390x"  # openblas not avail on excluded platform
 license="BSD"
 depends=""
 depends_dev="openblas-dev"