build: don't add libraries when --enable-static

Currently when building with --enabled-static the cctest target will include libraries to be linked regardless. This commit adds a condition to only add the libraries when dynamically linking.

This commit re-adds the previously reverted commit (be63c26e "build: don't add libraries when --enable-static"). The reason that commit failed was a mistake on my part where I moved the the list into a variable (thinking that it was a simple change that would not affect anything) and not re-running CI. But the list itself contains variables used to enable differences in operating systems/compilers where the object file locations vary.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines

Affected core subsystem(s)

build