[cmake] Switch FATAL_ERROR to SEND_ERROR

It's possible for multiple distribution components to have missing
targets, and it's a lot more convenient to get all those errors in one
shot rather than having to fix them individually.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317148 91177308-0d34-0410-b5e6-96231b3b80d8

CMakeLists.txt

@@ -1001,13 +1001,13 @@ if(LLVM_DISTRIBUTION_COMPONENTS)
     if(TARGET ${target})
       add_dependencies(distribution ${target})
     else()
-      message(FATAL_ERROR "Specified distribution component '${target}' doesn't have a target")
+      message(SEND_ERROR "Specified distribution component '${target}' doesn't have a target")
     endif()
 
     if(TARGET install-${target})
       add_dependencies(install-distribution install-${target})
     else()
-      message(FATAL_ERROR "Specified distribution component '${target}' doesn't have an install target")
+      message(SEND_ERROR "Specified distribution component '${target}' doesn't have an install target")
     endif()
   endforeach()
 endif()