Fix determination of evaluating link libraries.

Added in commit 6fbe3ce4 (Exclude the LINK_LIBRARIES related properties
from INTERFACE evaluation., 2013-01-23)

Source/cmGeneratorExpressionDAGChecker.cxx

@@ -148,8 +148,8 @@ bool cmGeneratorExpressionDAGChecker::EvaluatingLinkLibraries()
   return (strcmp(prop, "LINK_LIBRARIES") == 0
        || strcmp(prop, "LINK_INTERFACE_LIBRARIES") == 0
        || strcmp(prop, "IMPORTED_LINK_INTERFACE_LIBRARIES") == 0
-       || strncmp(prop, "LINK_INTERFACE_LIBRARIES_", 26) == 0
-       || strncmp(prop, "IMPORTED_LINK_INTERFACE_LIBRARIES_", 35) == 0);
+       || strncmp(prop, "LINK_INTERFACE_LIBRARIES_", 25) == 0
+       || strncmp(prop, "IMPORTED_LINK_INTERFACE_LIBRARIES_", 34) == 0);
 }
 
 //----------------------------------------------------------------------------