Fix downstream MinGW build by not looking for Boost Regex

src/libstore/meson.build

@@ -101,7 +101,11 @@ subdir('nix-meson-build-support/libatomic')
 
 boost = dependency(
   'boost',
-  modules : [ 'container', 'regex' ],
+  modules : [
+    'container',
+    # Shouldn't list, because can header-only, and Meson currently looks for libs
+    #'regex',
+  ],
   include_type : 'system',
 )
 # boost is a public dependency, but not a pkg-config dependency unfortunately, so we