meson: build getopt when using msvc

v4: - Don't wrap a single file in a list to match mesa style
    - Use null_dep instead of empty list

Reviewed-by: Eric Anholt <eric@anholt.net> (v3)
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>

src/getopt/meson.build

@@ -0,0 +1,29 @@
+# Copyright © 2018 Intel Corporation
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+libgetopt = static_library(
+  'getopt',
+  'getopt_long.c',
+)
+
+idep_getopt = declare_dependency(
+  link_with : libgetopt,
+  include_directories : include_directories('.', is_system : true),
+)

src/meson.build

@@ -47,6 +47,11 @@ sha1_h = custom_target(
 )
 
 subdir('gtest')
+if cc.get_id() == 'msvc'
+  subdir('getopt')
+else
+  idep_getopt = null_dep
+endif
 subdir('util')
 subdir('mapi')
 # TODO: opengl