libgsoap.so undefined symbols (soap_faultdetail, soap_putheader)

Since updating to focal, libgsoap.so (and libgsoapssl.so or libgsoap++.so) report undefined symbols. These symbols are defined by the generated code, but AFAIK the currently built target cannot provide undefined symbols to its dependencies.

~~~
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgsoap.so: undefined reference to `soap_faultdetail'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgsoap.so: undefined reference to `soap_faultsubcode'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgsoap.so: undefined reference to `soap_faultcode'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgsoap.so: undefined reference to `soap_putheader'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgsoap.so: undefined reference to `soap_fault_string'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgsoap.so: undefined reference to `soap_fault_detail'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgsoap.so: undefined reference to `soap_faultstring'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgsoap.so: undefined reference to `soap_putfault'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgsoap.so: undefined reference to `soap_fault_subcode'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgsoap.so: undefined reference to `soap_serializefault'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgsoap.so: undefined reference to `soap_getfault'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgsoap.so: undefined reference to `soap_serializeheader'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/libgsoap.so: undefined reference to `soap_getheader'
~~~

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gsoap 2.8.91-2
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Tue May 12 07:57:31 2020
InstallationDate: Installed on 2019-05-07 (370 days ago)
InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
SourcePackage: gsoap
UpgradeStatus: Upgraded to focal on 2020-05-09 (2 days ago)