[Toybox] [PATCH] Support HOSTCFLAGS on musl

[orc]

This patch adds support for specifying HOSTCFLAGS, for
something like "make menuconfig HOSTCFLAGS=-D_GNU_SOURCE" on
musl systems.

diff -Naur toybox-0.3.0.o/kconfig/Makefile toybox-0.3.0/kconfig/Makefile
--- toybox-0.3.0.o/kconfig/Makefile     2012-06-12 14:14:50.000000000
+0800 +++ toybox-0.3.0/kconfig/Makefile       2012-06-13
22:43:11.343051480 +0800 @@ -53,12 +53,12 @@
 gen_config.h: .config

 kconfig/mconf: $(SHIPPED)
-       $(HOSTCC) -o $@ kconfig/mconf.c kconfig/zconf.tab.c \
+       $(HOSTCC) $(HOSTCFLAGS) -o $@ kconfig/mconf.c
 kconfig/zconf.tab.c \ kconfig/lxdialog/*.c -lcurses
 -DCURSES_LOC="<ncurses.h>" \ -DKBUILD_NO_NLS=1
 -DPROJECT_NAME=\"$(KCONFIG_PROJECT)\"

 kconfig/conf: $(SHIPPED)
-       $(HOSTCC) -o $@ kconfig/conf.c kconfig/zconf.tab.c
 -DKBUILD_NO_NLS=1 \
+       $(HOSTCC) $(HOSTCFLAGS) -o $@ kconfig/conf.c
 kconfig/zconf.tab.c -DKBUILD_NO_NLS=1 \
 -DPROJECT_NAME=\"$(KCONFIG_PROJECT)\"

 clean::

There is one issue remain on musl systems. musl has no crypt.h,
but I don't know where to put crypt.h in lib/portability.h (maybe musl
will add crypt.h in future).
Also, no lex and yacc sources for pregenerated *_shipped in kconf (this
is not so necessary, but even busybox and linux kernel has *.l and *.y
on their places :-) ).