98e118ca43
Avoid using the same library for runtime and compiler. `FortranDecimal` was used in two ways: 1. As an auxiliary library needed for `libFortranRuntime.a`. This patch adds the two source files of FortranDecimal directly into FortranRuntime, so `FortranRuntime` is not used anymore. 2. As a library used by the Flang compiler. As the only remaining use of the library, extra CMake code to make it compatible with the runtime can be removed. Before this PR, `enable_cuda_compilation` is applied to `FortranDecimal` which causes everything that links to it, including flang (the compiler), to depend on libcudart when CUDA support is enabled. Having two runtime library just makes everything more complicated while the user ideally should not be concerned with how the runtime is structured internally. Some logic was copied for FortranDecimal because of this, such as the ability to be compiled out-of tree (b75a3c9f31) which is undocumented, the logic to link against the various versions of Microsofts runtime library (#70833), and avoiding dependency on the C++ runtime (7783bba22c).
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