[#7] Fix Windows build for architecture utilities

- Define _USE_MATH_DEFINES when building bsk_arch_utilities with MSVC
- Restore access to M_PI and M_PI_2 in vendored Basilisk utility sources

Author: schaubh

CMakeLists.txt

@@ -97,6 +97,9 @@ add_library(bsk::arch_utilities ALIAS bsk_arch_utilities)
 
 target_compile_features(bsk_arch_utilities PUBLIC cxx_std_17)
 target_link_libraries(bsk_arch_utilities PUBLIC bsk::sdk_headers Eigen3::Eigen)
+if(MSVC)
+  target_compile_definitions(bsk_arch_utilities PRIVATE _USE_MATH_DEFINES)
+endif()
 
 set_target_properties(bsk_arch_utilities PROPERTIES POSITION_INDEPENDENT_CODE ON)