Rework to build by autoconf/automake and new Debian scripts

Building in local machine:
    $ sh autogen.sh
    $ ./configure
    $ make
    $ sudo make install

Building Debian package:
    $ debuild -uc -us -b

Signed-off-by: Dongjin Kim <tobetter@gmail.com>
Change-Id: I76faa07c1586658d053a3e260ea231a19392f792

gpio/Makefile.am

@@ -0,0 +1,14 @@
+sbin_PROGRAMS = gpio
+
+gpio_SOURCES = \
+	gpio.c \
+	readall.c
+
+gpio_CFLAGS = \
+	-I ../wiringPi \
+	@EXTRA_CFLAGS@ \
+	$(LIBCRYPT_CFLAGS)
+
+gpio_LDFLAGS = \
+	-L../wiringPi/.libs -lwiringPi \
+	$(LIBCRYPT_LIBS)