AqBanking

The configure.ac currently sets the LIBS variable to empty, as a side effect of the ldl test, which voids whatever might have been provided via the command line or environment variable by the user. vcpkg, for example, uses that to inject a set([1]) of default win32 api dlls to be linked against, which get lost in the process. This patch fixes that.

[1] -llibxml2 -lwsock32 -lintl -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -lcomdlg32 -ladvapi32 -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -lcomdlg32 -ladvapi32