ZEN: Disable stack conservation for GCC

There's plenty of room on the stack for a few more inlined bytes here
and there. The measured stack usage at runtime is still safe without
this, and performance is surely improved at a microscopic level, so
remove it.

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>

Makefile

@@ -934,9 +934,6 @@ KBUILD_CFLAGS	+= -fno-strict-overflow
 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 KBUILD_CFLAGS  += -fno-stack-check
 
-# conserve stack if available
-KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
-
 # Prohibit date/time macros, which would make the build non-deterministic
 KBUILD_CFLAGS   += -Werror=date-time