fix: do not explicitly build static lib

[topazus]

It is better to set BUILD_SHARED_LIBS option to build shared or static lib than to explicitly build the library as static.

[wineee]

qwlroots was originally intended to be a header only library, but the remaining small amount of implementation is in cpp
1, 2, using dynamic libraries will not significantly reduce the size of program, and I prefer to build qwlroots as static libraries by default

[felixonmars]

Applied in Arch packaging as well. We also prefer shared libraries generally as a distribution.

[zccrs]

Thanks.

[zccrs]

Thanks.