add minimal meson build system for subprojects

meson.build

@@ -0,0 +1,65 @@
+project('zlib', 'c', version : '1.3.1', license : 'zlib')
+
+# Based on https://github.com/mesonbuild/zlib/blob/1.2.11/meson.build
+
+cc = meson.get_compiler('c')
+
+link_args = []
+compile_args = []
+if cc.get_id() == 'msvc'
+  add_project_arguments('-D_CRT_SECURE_NO_DEPRECATE',
+    '-D_CRT_NONSTDC_NO_DEPRECATE', language : 'c')
+else
+  # Don't spam consumers of this wrap with these warnings
+  compile_args += cc.get_supported_arguments(['-Wno-implicit-fallthrough',
+                                              '-Wno-implicit-function-declaration',
+                                              '-Wno-deprecated-non-prototype'])
+  if cc.get_id() == 'gcc' and host_machine.system() != 'windows'
+    vflag = '-Wl,--version-script,@0@/zlib.map'.format(meson.current_source_dir())
+    link_args += [vflag]
+  endif
+endif
+
+src = files([
+  'adler32.c',
+  'crc32.c',
+  'deflate.c',
+  'infback.c',
+  'inffast.c',
+  'inflate.c',
+  'inftrees.c',
+  'trees.c',
+  'zutil.c',
+  'compress.c',
+  'uncompr.c',
+  'gzclose.c',
+  'gzlib.c',
+  'gzread.c',
+  'gzwrite.c'])
+
+headers = files(['zconf.h', 'zlib.h'])
+
+if host_machine.system() == 'windows'
+  win = import('windows')
+  win_args = []
+  if cc.get_id() != 'msvc'
+    win_args += '-DGCC_WINDRES'
+  endif
+  src += win.compile_resources('win32/zlib1.rc', args : win_args)
+endif
+
+zlib = library('z', src,
+  c_args : compile_args,
+  link_args : link_args,
+  vs_module_defs : 'win32/zlib.def',
+  install : false,
+  build_by_default : false)
+
+incdir = include_directories('.')
+
+zlib_dep = declare_dependency(
+  link_with : zlib,
+  include_directories : incdir)
+
+meson.override_dependency('zlib', zlib_dep)
+