build: remove ICU handling in the android host handling

The host tools do not use ICU, only the standard library does.  Remove
the special handling in the host tool path for ICU.  This simplifies the
flag computation and allows the ICU handling to be sunk entirely into
the target specific paths.

Author: compnerd

cmake/modules/AddSwift.cmake

@@ -380,11 +380,6 @@ function(_add_host_variant_link_flags target)
     target_link_libraries(${target} PRIVATE
       ${cxx_link_libraries})
 
-    # link against the ICU libraries
-    target_link_libraries(${target} PRIVATE
-      ${SWIFT_ANDROID_${SWIFT_HOST_VARIANT_ARCH}_ICU_I18N}
-      ${SWIFT_ANDROID_${SWIFT_HOST_VARIANT_ARCH}_ICU_UC})
-
     swift_android_lib_for_arch(${SWIFT_HOST_VARIANT_ARCH}
       ${SWIFT_HOST_VARIANT_ARCH}_LIB)
     target_link_directories(${target} PRIVATE
@@ -402,19 +397,6 @@ function(_add_host_variant_link_flags target)
     endif()
   endif()
 
-  if(NOT "${SWIFT_${SWIFT_HOST_VARIANT_SDK}_${SWIFT_HOST_VARIANT_SDK}_ICU_UC}" STREQUAL "")
-    get_filename_component(SWIFT_${SWIFT_HOST_VARIANT_SDK}_${SWIFT_HOST_VARIANT_ARCH}_ICU_UC_LIBDIR
-      "${SWIFT_${SWIFT_HOST_VARIANT_SDK}_${SWIFT_HOST_VARIANT_SDK}_ICU_UC}" DIRECTORY)
-    target_link_directories(${target} PRIVATE
-      "${SWIFT_${SWIFT_HOST_VARIANT_SDK}_${SWIFT_HOST_VARIANT_ARCH}_ICU_UC_LIBDIR}")
-  endif()
-  if(NOT "${SWIFT_${SWIFT_HOST_VARIANT_SDK}_${SWIFT_HOST_VARIANT_ARCH}_ICU_I18N}" STREQUAL "")
-    get_filename_component(SWIFT_${SWIFT_HOST_VARIANT_SDK}_${SWIFT_HOST_VARIANT_SDK}_ICU_I18N_LIBDIR
-      "${SWIFT_${SWIFT_HOST_VARIANT_SDK}_${SWIFT_HOST_VARIANT_ARCH}_ICU_I18N}" DIRECTORY)
-    target_link_directories(${target} PRIVATE
-      "${SWIFT_${SWIFT_HOST_VARIANT_SDK}_${SWIFT_HOST_VARIANT_ARCH}_ICU_I18N_LIBDIR}")
-  endif()
-
   if(NOT SWIFT_COMPILER_IS_MSVC_LIKE)
     # FIXME: On Apple platforms, find_program needs to look for "ld64.lld"
     find_program(LDLLD_PATH "ld.lld")