amdblis + blis: fix spack info and libs query (#15566)

var/spack/repos/builtin/packages/amdblis/package.py

@@ -15,6 +15,7 @@ class Amdblis(BlisBase):
     computationally intensive operations.
     """
 
+    _name = 'amdblis'
     homepage = "https://developer.amd.com/amd-aocl/blas-library/"
     url = "https://github.com/amd/blis/archive/2.1.tar.gz"
     git = "https://github.com/amd/blis.git"

var/spack/repos/builtin/packages/blis/package.py

@@ -102,6 +102,10 @@ def darwin_fix(self):
         if self.spec.satisfies('platform=darwin'):
             fix_darwin_install_name(self.prefix.lib)
 
+    @property
+    def libs(self):
+        return find_libraries(['libblis'], root=self.prefix, recursive=True)
+
 
 class Blis(BlisBase):
     """BLIS is a portable software framework for instantiating high-performance