build: add support for building with meson

Follow the OpenBMC herd and support a more modern, more comprehensible,
more performant build framework.

To build using meson:
   meson build
   ninja -C build
   ninja -C build install

Added -Dtests to match de-facto OpenBMC meson usage conventions.

Dropped support for --enable-oe-sdk rpath munging.  This was a
workaround for broken oe sdks that don't figure out the correct rpath
when running make check or ninja test.

Ran existing unit tests (which passed) using ninja test.

Change-Id: I198700d866e1b23ba0a22b156335bbb973b98f43
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/gpio-util/meson.build b/gpio-util/meson.build
new file mode 100644
index 0000000..d14cbc3
--- /dev/null
+++ b/gpio-util/meson.build
@@ -0,0 +1,12 @@
+executable(
+    'phosphor-gpio-util',
+    'argument.cpp',
+    'gpio.cpp',
+    'main.cpp',
+    dependencies: [
+        phosphor_logging,
+    ],
+    include_directories: '..',
+    implicit_include_directories: false,
+    install: true,
+)