add parallel windows support

config/ext.json

@@ -190,7 +190,10 @@
     "parallel": {
         "type": "external",
         "source": "parallel",
-        "arg-type-windows": "with"
+        "arg-type-windows": "with",
+        "lib-depends-windows": [
+            "pthreads4w"
+        ]
     },
     "ldap": {
         "type": "builtin",

config/lib.json

@@ -125,6 +125,12 @@
             "gmp.h"
         ]
     },
+    "pthreads4w": {
+        "source": "pthreads4w",
+        "static-libs-windows": [
+            "libpthreadVC3.lib"
+        ]
+    },
     "icu": {
         "source": "icu",
         "cpp-library": true,

config/source.json

@@ -52,6 +52,15 @@
             "path": "COPYING"
         }
     },
+    "pthreads4w": {
+        "type": "git",
+        "rev": "master",
+        "url": "https://git.code.sf.net/p/pthreads4w/code",
+        "license": {
+            "type": "file",
+            "path": "LICENSE"
+        }
+    },
     "ext-ds": {
         "type": "url",
         "url": "https://pecl.php.net/get/ds",