kbuild: Escape "'" in cmd macro

Building drivers/eisa were broken in non-verbose mode.
This has been fixed by escaping "'" for cmd. It was used in $(call cmd,eisaid).
Escaping "'" is already done by if_changed, so this brings cmd in line with
if_changed

scripts/Makefile.lib

@@ -225,7 +225,7 @@ if_changed_rule = $(if $(strip $? \
 
 # If quiet is set, only print short version of command
 
-cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
+cmd = @$(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))' &&) $(cmd_$(1))
 
 #	$(call descend,<dir>,<target>)
 #	Recursively call a sub-make in <dir> with target <target>