Your app is running an outdated version of OpenSSL, which has multiple security vulnerabilities. You should update OpenSSL as soon as possible.
The following seems to work
Download openssl-1.0.2g.tar.gz from site: https://www.openssl.org/source/
untar to some directory (openssl-1.0.2g) is the default
ex: tar -xf openssl-1.0.2g.tar.gz
runup cygwin
cd to openssl-1.0.2g – then issue the following command
./config
make depend
make install
– you are done
ls *.a
libcrypto.a libssl.a
just replace these files in .\external\curl\prebuilt
Good luck
Andre