fix python for linux

packages/p/python/xmake.lua

@@ -28,6 +28,10 @@ package("python")
         add_deps("openssl", {host = true})
     end
 
+    if is_plat("linux") then
+        add_syslinks("pthread")
+    end
+
     add_resources("3.7.0", "setuptools",  "https://files.pythonhosted.org/packages/c2/f7/c7b501b783e5a74cf1768bc174ee4fb0a8a6ee5af6afa92274ff964703e0/setuptools-40.8.0.zip", "6e4eec90337e849ade7103723b9a99631c1f0d19990d6e8412dc42f5ae8b304d")
     add_resources("3.7.0", "pip",         "https://files.pythonhosted.org/packages/36/fa/51ca4d57392e2f69397cd6e5af23da2a8d37884a605f9e3f2d3bfdc48397/pip-19.0.3.tar.gz", "6e6f197a1abfb45118dbb878b5c859a0edbdd33fd250100bc015b67fded4b9f2")
     add_resources("3.7.0", "wheel",       "https://files.pythonhosted.org/packages/b7/cf/1ea0f5b3ce55cacde1e84cdde6cee1ebaff51bd9a3e6c7ba4082199af6f6/wheel-0.33.1.tar.gz", "66a8fd76f28977bb664b098372daef2b27f60dc4d1688cfab7b37a09448f0e9d")

packages/p/python2/xmake.lua

@@ -25,6 +25,10 @@ package("python2")
         add_deps("openssl", {host = true})
     end
 
+    if is_plat("linux") then
+        add_syslinks("pthread")
+    end
+
     add_resources("2.7.15", "setuptools", "https://files.pythonhosted.org/packages/c2/f7/c7b501b783e5a74cf1768bc174ee4fb0a8a6ee5af6afa92274ff964703e0/setuptools-40.8.0.zip", "6e4eec90337e849ade7103723b9a99631c1f0d19990d6e8412dc42f5ae8b304d")
     add_resources("2.7.15", "pip",        "https://files.pythonhosted.org/packages/36/fa/51ca4d57392e2f69397cd6e5af23da2a8d37884a605f9e3f2d3bfdc48397/pip-19.0.3.tar.gz", "6e6f197a1abfb45118dbb878b5c859a0edbdd33fd250100bc015b67fded4b9f2")
     add_resources("2.7.15", "wheel",      "https://files.pythonhosted.org/packages/b7/cf/1ea0f5b3ce55cacde1e84cdde6cee1ebaff51bd9a3e6c7ba4082199af6f6/wheel-0.33.1.tar.gz", "66a8fd76f28977bb664b098372daef2b27f60dc4d1688cfab7b37a09448f0e9d")