Allwmake: Simplified by removing 'doc' option

It is better to run doc/Allwmake or doc/Doxygen/Allwmake and provide the
required options.

Allwmake

 #!/bin/sh
 cd ${0%/*} || exit 1    # Run from this directory
 
-# Parse arguments for library compilation without documentation by default
-genDoc=0
+# Parse arguments for library compilation
 . $WM_PROJECT_DIR/wmake/scripts/AllwmakeParseArguments
 
 wmakeCheckPwd "$WM_PROJECT_DIR" || {
@@ -35,11 +34,5 @@ src/Allwmake $targetType $*
 # Compile OpenFOAM libraries and applications
 applications/Allwmake $targetType $*
 
-# Optionally build OpenFOAM Doxygen documentation
-if [ $genDoc -eq 1 ]
-then
-    doc/Allwmake
-fi
-
 
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