ur_controllers: Fix compilation on Windows (backport #1402)

[mergify]

The package compiles a library, but does not expose any symbol on Windows, so if the CMake project is compiled on on Windows, no library is actually generated.

On Linux and macOS, everything compiles by default all the symbols are visible. We can achieve exactly the same behavior in Windows by setting to ON the CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS CMake variable, so this PR sets the CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS variable to ON, to ensure that the compilation works fine on Windows.

Furthermore, the -Wpedantic -Werror are GCC/Clang specific compilations options, so I moved it in an if for adding GCC/Clang specific compilations options.

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This is an automatic backport of pull request #1402 done by Mergify.

[mergify]

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