Force make to use bash

Author: jahn

tools/genmake2

@@ -3138,6 +3138,7 @@ cat >>$MAKEFILE <<EOF
 # LINK         : Command for link editor program
 # LIBS         : Library flags /or/ additional optimization/debugging flags
 
+SHELL = bash
 ROOTDIR     = ${ROOTDIR}
 BUILDDIR    = ${BUILDDIR}
 SOURCEDIRS  = ${SOURCEDIRSMK}