Add libs attribute to mesa and mesa-glu packages (#8904)

Also fix dependency version in glvis package.
Fixes build errors mentioned in #8454.

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

@@ -82,7 +82,7 @@ class Glvis(MakefilePackage):
             description='Use antialiased fonts via freetype & fontconfig')
 
     depends_on('mfem@develop', when='@develop')
-    depends_on('mfem@3.4', when='@3.4')
+    depends_on('mfem@3.4.0', when='@3.4')
     depends_on('mfem@3.3', when='@3.3')
     depends_on('mfem@3.2', when='@3.2')
     depends_on('mfem@3.1', when='@3.1')

var/spack/repos/builtin/packages/mesa-glu/package.py

@@ -22,7 +22,6 @@
 # License along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ##############################################################################
-#
 from spack import *
 
 
@@ -39,3 +38,11 @@ class MesaGlu(AutotoolsPackage):
     depends_on('mesa', when='+mesa')
 
     provides('glu@1.3')
+
+    @property
+    def libs(self):
+        for dir in ['lib64', 'lib']:
+            libs = find_libraries('libGLU', join_path(self.prefix, dir),
+                                  shared=True, recursive=False)
+            if libs:
+                return libs

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

@@ -197,3 +197,11 @@ def configure(self, spec, prefix):
                 configure(*options)
             else:
                 raise
+
+    @property
+    def libs(self):
+        for dir in ['lib64', 'lib']:
+            libs = find_libraries('libGL', join_path(self.prefix, dir),
+                                  shared=True, recursive=False)
+            if libs:
+                return libs

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

@@ -80,9 +80,6 @@ def fetcher(self):
         of OpenGL your Mac uses."""
         raise InstallError(msg)
 
-    def install(self, spec, prefix):
-        pass
-
     @property
     def libs(self):
         for dir in ['lib64', 'lib']:
@@ -90,4 +87,3 @@ def libs(self):
                                   shared=True, recursive=False)
             if libs:
                 return libs
-        return None

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

@@ -76,9 +76,6 @@ def fetcher(self):
 
         raise InstallError(msg)
 
-    def install(self, spec, prefix):
-        pass
-
     @property
     def libs(self):
         for dir in ['lib64', 'lib']:
@@ -86,4 +83,3 @@ def libs(self):
                                   shared=True, recursive=False)
             if libs:
                 return libs
-        return None