Add support for building as a Meson subproject

meson.build

@@ -0,0 +1,15 @@
+project('miniz', 'c')
+
+miniz_includes = include_directories('.')
+
+cfg = configuration_data()
+cfg.set('MINIZ_EXPORT', '')
+miniz_export_h = configure_file(output: 'miniz_export.h',
+                                configuration: cfg)
+
+libminiz = static_library('miniz',
+                          miniz_export_h, 'miniz.c', 'miniz_zip.c', 'miniz_tinfl.c', 'miniz_tdef.c',
+                          include_directories: miniz_includes)
+
+miniz_dependency = declare_dependency(link_with: libminiz,
+                                      include_directories: miniz_includes)