ENH: also accept 'lib' for metis and scotch libraries

- this corresponds to what various module or build systems provide.
  ThirdParty builds are unaffected since they install into FOAM_EXT_LIBBIN

src/parallel/decompose/Allwmake

@@ -36,6 +36,7 @@ hasMetis()
 
     # Library
     [ -r $FOAM_EXT_LIBBIN/libmetis.so ] || \
+    [ -r $METIS_ARCH_PATH/lib/libmetis.so ] || \
     [ -r $METIS_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH/libmetis.so ] || \
     [ "${METIS_ARCH_PATH##*-}" = system ] || {
         echo "$warning (missing library)"
@@ -90,6 +91,7 @@ hasScotch()
 
     # Library
     [ -r $FOAM_EXT_LIBBIN/libscotch.so ] || \
+    [ -r $SCOTCH_ARCH_PATH/lib/libscotch.so ] || \
     [ -r $SCOTCH_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH/libscotch.so ] || \
     [ "${SCOTCH_ARCH_PATH##*-}" = system ] || {
         echo "$warning (missing library)"

src/parallel/decompose/metisDecomp/Make/options

@@ -8,6 +8,7 @@ EXE_INC = \
  * to support central, non-thirdparty installations
  */
 LIB_LIBS = \
+    -L$(METIS_ARCH_PATH)/lib \
     -L$(METIS_ARCH_PATH)/lib$(WM_COMPILER_LIB_ARCH) \
     -L$(FOAM_EXT_LIBBIN) \
     -lmetis

src/parallel/decompose/ptscotchDecomp/Make/options

@@ -16,6 +16,7 @@ EXE_INC = \
  * to support central, non-thirdparty installations
  */
 LIB_LIBS = \
+    -L$(SCOTCH_ARCH_PATH)/lib \
     -L$(SCOTCH_ARCH_PATH)/lib$(WM_COMPILER_LIB_ARCH) \
     -L$(FOAM_EXT_LIBBIN) \
     -L$(FOAM_EXT_LIBBIN)/$(FOAM_MPI) \

src/parallel/decompose/scotchDecomp/Make/options

@@ -16,6 +16,7 @@ EXE_INC = \
  * to support central, non-thirdparty installations
  */
 LIB_LIBS = \
+    -L$(SCOTCH_ARCH_PATH)/lib \
     -L$(SCOTCH_ARCH_PATH)/lib$(WM_COMPILER_LIB_ARCH) \
     -L$(FOAM_EXT_LIBBIN) \
     -lscotch \