refactor ~ (makefiles) fix spelling + add spell-checker exceptions

GNUmakefile

@@ -1,3 +1,5 @@
+# spell-checker:ignore (misc) testsuite runtest (targets) busytest distclean manpages pkgs ; (vars/env) BINDIR BUILDDIR CARGOFLAGS DESTDIR DOCSDIR INSTALLDIR INSTALLEES MANDIR MULTICALL
+
 # Config options
 PROFILE         ?= debug
 MULTICALL       ?= n
@@ -274,7 +276,7 @@ busybox-src:
 $(BUILDDIR)/.config: $(BASEDIR)/.busybox-config
 	cp $< $@
 
-# Test under the busybox testsuite
+# Test under the busybox test suite
 $(BUILDDIR)/busybox: busybox-src build-coreutils $(BUILDDIR)/.config
 	cp $(BUILDDIR)/coreutils $(BUILDDIR)/busybox; \
 	chmod +x $@;

Makefile

@@ -1,5 +1,5 @@
-USEGNU=gmake $*
+UseGNU=gmake $*
 all:
-	@$(USEGNU)
+	@$(UseGNU)
 .DEFAULT:
-	@$(USEGNU)
+	@$(UseGNU)