pylibfdt: Add missing CC and LD to Makefile

Add missing CC and LDSHARED variables to the Makefile to pass the
correct C compiler and linker path to the build of _libfdt.so .

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>

scripts/dtc/pylibfdt/Makefile

@@ -14,7 +14,8 @@ PYLIBFDT_srcs = $(addprefix $(LIBFDT_srcdir)/,$(LIBFDT_SRCS)) \
 		$(obj)/libfdt.i
 
 quiet_cmd_pymod = PYMOD   $@
-      cmd_pymod = unset CC; unset CROSS_COMPILE; unset CFLAGS;\
+      cmd_pymod = unset CROSS_COMPILE; unset CFLAGS; \
+		CC="$(HOSTCC)" LDSHARED="$(HOSTCC) -shared " \
 		LDFLAGS="$(HOSTLDFLAGS)" \
 		VERSION="u-boot-$(UBOOTVERSION)" \
 		CPPFLAGS="$(HOSTCFLAGS) -I$(LIBFDT_srcdir)" OBJDIR=$(obj) \