[fix][client-cpp] Fix static compilation that includes openssl

[lhotari]

Motivation

Master branch is broken at the moment.

../lib/.libs/libcurl.so: undefined reference to `SSL_CTX_set_keylog_callback@OPENSSL_1_1_1'
../lib/.libs/libcurl.so: undefined reference to `SSL_CTX_set_ciphersuites@OPENSSL_1_1_1'
collect2: error: ld returned 1 exit status
make[2]: *** [curl] Error 1
Makefile:839: recipe for target 'curl' failed
make[2]: Leaving directory '/curl-7.61.0/src'
make[1]: *** [all-recursive] Error 1
Makefile:1878: recipe for target 'all-recursive' failed
make[1]: Leaving directory '/curl-7.61.0/src'
Makefile:927: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1

Modifications

Fix the static compilation that intends to include a locally built version of openssl. The linking configuration was invalid.

Documentation

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[lhotari]

closing since @BewareMyPower will provide another PR with an improved solution