Makefile: have "all" target depend on "bootstrap" target to make and …

…gawk locally built in expected 4.2.1 versions.

This applies to debian-11 and other newer OSes.

Fixes a bug where "make BOARD=xyz bootstrap" was needed prior of being able to build anything else otherwise HEADS_GAWK was expecting HEADS_MAKE to be built already, which was not the case.
(fixes linuxboot#1126)

As of now, I do not see any OS make/gawk being used anymore.
All modules except coreboot (which uses coreboot buildstack), including musl-cross-make, are being built with local make and local gawk.
Improves linuxboot#936 (comment) which showed that local make (/usb/bin/make, /usr/local/bin/make, /usr/sbin/make, /usr/local/sbin/make and /usr/bin/gawk were called locally. To redo)

Makefile

@@ -91,9 +91,9 @@ $(HEADS_MAKE): $(build)/$(make_dir)/.configured
 
 # Once we have a proper Make, we can just pass arguments into it
 all linux cpio run: $(HEADS_MAKE)
-        LANG=C MAKE=$(HEADS_MAKE) $(HEADS_MAKE) $(MAKE_JOBS) $@
+        LANG=C MAKE=$(HEADS_MAKE) $(MAKE_JOBS) $@
 %.clean %.vol %.menuconfig: $(HEADS_MAKE)
-        LANG=C MAKE=$(HEADS_MAKE) $(HEADS_MAKE) $@
+        LANG=C MAKE=$(HEADS_MAKE) $@
 
 bootstrap: $(HEADS_MAKE)
 endif
@@ -143,6 +143,9 @@ all linux cpio run: $(HEADS_GAWK)
 bootstrap: $(HEADS_GAWK)
 endif
 
+#We want to make sure we build bootstrap target if needed.
+all: bootstrap;
+
 BOARD		?= qemu-coreboot
 CONFIG		:= $(pwd)/boards/$(BOARD)/$(BOARD).config