travis: upgraded pcre to 8.44.

Author: agentzh

.travis.yml

@@ -34,7 +34,7 @@ env:
     - LUAJIT_LIB=$LUAJIT_PREFIX/lib
     - LUAJIT_INC=$LUAJIT_PREFIX/include/luajit-2.1
     - LUA_INCLUDE_DIR=$LUAJIT_INC
-    - PCRE_VER=8.41
+    - PCRE_VER=8.44
     - PCRE_PREFIX=/opt/pcre
     - PCRE_LIB=$PCRE_PREFIX/lib
     - PCRE_INC=$PCRE_PREFIX/include
@@ -64,7 +64,7 @@ before_install:
 
 install:
   - if [ ! -f download-cache/drizzle7-$DRIZZLE_VER.tar.gz ]; then wget -P download-cache http://openresty.org/download/drizzle7-$DRIZZLE_VER.tar.gz; fi
-  - if [ ! -f download-cache/pcre-$PCRE_VER.tar.gz ]; then wget -P download-cache http://ftp.cs.stanford.edu/pub/exim/pcre/pcre-$PCRE_VER.tar.gz; fi
+  - if [ ! -f download-cache/pcre-$PCRE_VER.tar.gz ]; then wget -P download-cache https://ftp.pcre.org/pub/pcre/pcre-$PCRE_VER.tar.gz; fi
   - if [ ! -f download-cache/openssl-$OPENSSL_VER.tar.gz ]; then wget -P download-cache https://www.openssl.org/source/openssl-$OPENSSL_VER.tar.gz; fi
   - git clone https://github.com/openresty/test-nginx.git
   - git clone https://github.com/openresty/openresty.git ../openresty