Update libcurl and zlib project file

Signed-off-by: Frank Li <lznuaa@gmail.com>

diff --git a/ext/libcurl b/ext/libcurl
index 28e2a94..634a6e9 160000 (submodule)
--- a/ext/libcurl
+++ b/ext/libcurl
@@ -1 +1 @@
-Subproject commit 28e2a94d82c0dc05ca424adc46d65cf67b9179c2
+Subproject commit 634a6e9155377826aa389b9d405c9b2e28c2ef0a

diff --git a/ext/zlib b/ext/zlib
index 2a715a6..b016783 160000 (submodule)
--- a/ext/zlib
+++ b/ext/zlib
@@ -1 +1 @@
-Subproject commit 2a715a6797ccb036b9c1c95fa088a41934476462
+Subproject commit b01678335da15a3ce623582952096bce243cacdc