build: Common CMake scripts are no longer common

src/CMakeLists.txt

@@ -33,9 +33,6 @@ set_property(CACHE UNITS_DOWNCAST_MODE PROPERTY STRINGS AUTO ON OFF)
 # set path to custom cmake modules
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../cmake")
 
-# include common tools and workarounds
-include(common/scripts)
-
 find_package(fmt CONFIG REQUIRED)
 find_package(Microsoft.GSL CONFIG REQUIRED)
 
@@ -83,6 +80,8 @@ endif()
 
 add_library(mp-units::mp-units ALIAS mp-units)
 
+include(install)
+
 # installation info
 install_targets(mp-units)
 install(DIRECTORY include/units