Update pcre download url

CMake Error at /host/build/libpcre-prefix/src/libpcre-stamp/download-libpcre.cmake:159 (message):
  Each download failed!

    error: downloading 'https://ftp.pcre.org/pub/pcre/pcre-8.43.tar.gz' failed
         status_code: 6
         status_string: "Couldn't resolve host name"
         log:
         --- LOG BEGIN ---
         Could not resolve host: ftp.pcre.org

  Closing connection 0

lighttpd/Findlighttpd.cmake

@@ -23,7 +23,7 @@ macro(lighttpd_build_server outfile)
     ExternalProject_Add(
         libpcre
         URL
-        https://ftp.pcre.org/pub/pcre/pcre-8.43.tar.gz
+        https://sourceforge.net/projects/pcre/files/pcre/8.43/pcre-8.43.tar.gz
         BINARY_DIR
         ${CMAKE_CURRENT_BINARY_DIR}/libprce-prefix/src/libpcre
         BUILD_ALWAYS