cmTarget: Test impliedByUse number-compatible properties.

Test that it is an error to read a number-compatible property to
determine the link implementation.  An alternative would be to
consider the value to be "0", however, that is too arbitrary
given the use-cases of this feature.  Values from this feature may
be used in setting a define, where "0" may have special or invalid
meaning and should be explicit.

Tests/RunCMake/CompatibleInterface/InterfaceNumber-mismatched-use-result.txt

@@ -0,0 +1 @@
+1

Tests/RunCMake/CompatibleInterface/InterfaceNumber-mismatched-use-stderr.txt

@@ -0,0 +1,4 @@
+CMake Error: Property SOMEPROP on target "user" is
+implied to be empty because it was used to determine the link libraries
+already. The INTERFACE_SOMEPROP property on
+dependency "foo" is in conflict.

Tests/RunCMake/CompatibleInterface/InterfaceNumber-mismatched-use.cmake

@@ -0,0 +1,9 @@
+
+add_library(foo UNKNOWN IMPORTED)
+add_library(bar UNKNOWN IMPORTED)
+
+set_property(TARGET foo APPEND PROPERTY COMPATIBLE_INTERFACE_NUMBER_MIN SOMEPROP)
+set_property(TARGET foo PROPERTY INTERFACE_SOMEPROP 42)
+
+add_executable(user main.cpp)
+target_link_libraries(user foo $<$<STREQUAL:$<TARGET_PROPERTY:SOMEPROP>,42>:bar>)

Tests/RunCMake/CompatibleInterface/RunCMakeTest.cmake

@@ -7,6 +7,7 @@ run_cmake(InterfaceBool-builtin-prop)
 run_cmake(InterfaceString-mismatch-depends)
 run_cmake(InterfaceString-mismatch-depend-self)
 run_cmake(InterfaceString-mismatched-use)
+run_cmake(InterfaceNumber-mismatched-use)
 run_cmake(InterfaceString-builtin-prop)
 run_cmake(InterfaceString-Bool-Conflict)
 run_cmake(InterfaceString-Bool-Min-Conflict)