xen/build: introduce if_changed and if_changed_rule

xen/build: introduce if_changed and if_changed_rule

The if_changed macro from Linux, in addition to check if any files
needs an update, check if the command line has changed since the last
invocation. The latter will force a rebuild if any options to the
executable have changed.

if_changed_rule checks dependencies like if_changed, but execute
rule_$(1) instead of cmd_$(1) when a target needs to be rebuilt. A rule_
macro can call more than one cmd_ macro. One of the cmd_ macro in a
rule need to be call using a macro that record the command line, so
cmd_and_record is introduced. It is similar to cmd_and_fixup from
Linux but without a call to fixdep which we don't have yet. (We will
later replace cmd_and_record by cmd_and_fixup.)

Example of a rule_ macro:
define rule_cc_o_c
    $(call cmd_and_record,cc_o_o)
    $(call cmd,objcopy)
endef

This needs one of the call to use cmd_and_record, otherwise no .*.cmd
file will be created, and the target will keep been rebuilt.

In order for if_changed to works correctly, we need to load the .%.cmd
files that the macro generates, this is done by adding targets in to
the $(targets) variable. We use intermediate_targets to add %.init.o
dependency %.o to target since there aren't in obj-y.

We also add $(MAKECMDGOALS) to targets so that when running for
example `make common/memory.i`, make will load the associated .%.cmd
dependency file.

Beside the if_changed*, we import the machinery used for a "beautify
output". The important one is when running make with V=2 which help to
debug the makefiles by printing why a target is been rebuilt, via the
$(echo-why) macro.

if_changed and if_changed_rule aren't used yet.

Most of this code is copied from Linux v5.4, including the
documentation.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>