disabling built-in rules in makefile

[Matúš Kukan]

Hi,

I've removed MAKEFLAGS+=-r in 0a45deba2be4a77db7540bd050b25bd6c26d7513
because I thought it's supposed to be used only for recursive make
invocation.
Now I see, it really makes a difference (for a reason unknown to me).
It probably should be only MAKEFLAGS += r (there is no - in the
variable if you use make -r)
anyway.. using
.SUFFIXES:

makes even bigger difference for me. Then it's the ~same as using make -r.
So, I suggest to do
-MAKEFLAGS+=-r
+.SUFFIXES:
in gbuild.mk

HTH,
Matus