COMP: handle mesa library in lib64 or lib (fixes #16)

- only addresses -mesa-prefix behaviour.
  The -mesa-lib option makes no assumptions at all.

STYLE: update versions in makeParaView.example, makeVTK.example

makeParaView

@@ -200,7 +200,9 @@ do
         [ "$#" -ge 2 ] || die "'$1' option requires an argument"
         withMESA=true
         MESA_INCLUDE="${2%%/}/include"
+        # Could be under (lib64 | lib)
         MESA_LIBRARY="${2%%/}/lib$WM_COMPILER_LIB_ARCH/libOSMesa.so"
+        [ -f "$MESA_LIBRARY" ] || MESA_LIBRARY="${2%%/}/lib/libOSMesa.so"
         shift
         ;;
     -mesa-include)

makeParaView.example

@@ -4,7 +4,8 @@
 # - mesa
 
 # mesa=mesa-11.2.2
-mesa=mesa-13.0.3
+# mesa=mesa-13.0.3
+mesa=mesa-17.1.1
 
 ./makeParaView \
     -mpi=0 \

makeVTK

@@ -183,7 +183,9 @@ do
         [ "$#" -ge 2 ] || die "'$1' option requires an argument"
         withMESA=true
         MESA_INCLUDE="${2%%/}/include"
+        # Could be under (lib64 | lib)
         MESA_LIBRARY="${2%%/}/lib$WM_COMPILER_LIB_ARCH/libOSMesa.so"
+        [ -f "$MESA_LIBRARY" ] || MESA_LIBRARY="${2%%/}/lib/libOSMesa.so"
         shift
         ;;
     -mesa-include)

makeVTK.example

@@ -2,9 +2,10 @@
 # An example for building particular combinations of VTK with
 # - mesa (off-screen only)
 
-vtk=VTK-7.1.0
+vtk=VTK-8.1.0
 # mesa=mesa-11.2.2
-mesa=mesa-13.0.3
+# mesa=mesa-13.0.3
+mesa=mesa-17.1.1
 
 ./makeVTK \
     $vtk \