Added meson build files and manifests for dlls.

Works, builds both native linux and cross-compiles mingw-w64 variants.
Need to work out copying appropriate dlls into the mkxp runtime folder.

Signed-off-by: Marty Plummer <ntzrmtthihu777@gmail.com>

binding-null/meson.build

@@ -0,0 +1,5 @@
+binding = static_library('binding',
+	'binding-null.cpp',
+	dependencies : [ sdl2, sigcxx ],
+	include_directories : incdirs)
+