Merge branch 'topic/gprbuild-m' into 'master'

Use gprbuild -m for builds

See merge request eng/ide/ada_language_server!1416

Author: eliericha

Makefile

@@ -35,7 +35,7 @@ TESTER=$(ROOTDIR)/.obj/tester/tester-run$(EXE)
 MOCHA_ALS_UPDATE=
 
 GPRBUILD_EXTRA=
-GPRBUILD_FLAGS=-j0 $(GPRBUILD_EXTRA)
+GPRBUILD_FLAGS=-m -j0 $(GPRBUILD_EXTRA)
 GPRBUILD=gprbuild $(GPRBUILD_FLAGS) -XSUPERPROJECT=
 GPRCLEAN_EXTRA=
 GPRCLEAN=gprclean -XSUPERPROJECT= $(GPRCLEAN_EXTRA)