CONFIG: adjust make scripts for darwin

- handling of dead links (find -L -delete unsupported)

- remove ignore case flag on 's/../../i' used in have_scotch script.
  It is unneeded and not tolerated by Darwin's sed.

- avoid embedded comments in EXE_INC (Make/options files), which do
  not work well with the OSX LLVM cpp.
  It strips out the comments but also removes the continuation char.

STYLE: adjust notes about paraview library locations

wmake/scripts/have_scotch

@@ -118,7 +118,7 @@ have_scotch()
     # Ensure consistent sizes between OpenFOAM and scotch header
     # extract 'typedef int64_t SCOTCH_Num' or equivalent
     label=$(sed -ne \
-        's/^.*typedef *\([^ ]*\) *SCOTCH_Num.*/\1/ip' \
+        's/^.*typedef *\([^ ]*\) *SCOTCH_Num.*/\1/p' \
         "$header")
     : ${label:=unknown} # Failsafe value
 

wmake/wmakeLnInclude

@@ -67,10 +67,7 @@ USAGE
 # Parse arguments and options
 #------------------------------------------------------------------------------
 
-# Default 'find' option
-unset findOpt
-
-# Default 'ln' option
+# Option for 'ln'
 lnOpt="-s"
 
 unset update silentOpt
@@ -149,23 +146,31 @@ fi
 #------------------------------------------------------------------------------
 # Remove any broken links first (this helps when file locations have moved)
 #------------------------------------------------------------------------------
-find -L . -type l -delete
+
+case "$WM_ARCH" in
+darwin*)
+    find -L . -type l -exec rm -- {} \+
+    ;;
+*)
+    find -L . -type l -delete
+    ;;
+esac
 
 
 #------------------------------------------------------------------------------
 # Create links, avoid recreating links unless necessary
 # things placed in the 'noLink' directory are skipped
 #------------------------------------------------------------------------------
-find .. $findOpt \
-     \( -name lnInclude -o -name Make -o -name config -o -name noLink \) \
-     -prune \
-     -o \( \
-     -name '*.[CHh]' \
-     -o -name '*.[ch]xx' \
-     -o -name '*.[ch]pp' \
-     -o -name '*.type' \
-     \)  \
-     -exec ln $lnOpt {} . \;
+find .. \
+    \( -name lnInclude -o -name Make -o -name config -o -name noLink \) \
+    -prune \
+    -o \( \
+        -name '*.[CHh]' \
+        -o -name '*.[ch]xx' \
+        -o -name '*.[ch]pp' \
+        -o -name '*.type' \
+    \)  \
+    -exec ln $lnOpt {} . \;
 
 exit 0 # clean exit