[Bridges] fix including files which are not .jl files (#2615)

Author: odow

src/Bridges/Constraint/Constraint.jl

@@ -18,7 +18,9 @@ include("set_map.jl")
 include("single_bridge_optimizer.jl")
 
 for filename in readdir(joinpath(@__DIR__, "bridges"); join = true)
-    include(filename)
+    if endswith(filename, ".jl")
+        include(filename)
+    end
 end
 
 """

src/Bridges/Objective/Objective.jl

@@ -13,7 +13,9 @@ include("map.jl")
 include("single_bridge_optimizer.jl")
 
 for filename in readdir(joinpath(@__DIR__, "bridges"); join = true)
-    include(filename)
+    if endswith(filename, ".jl")
+        include(filename)
+    end
 end
 
 """

src/Bridges/Variable/Variable.jl

@@ -14,7 +14,9 @@ include("set_map.jl")
 include("single_bridge_optimizer.jl")
 
 for filename in readdir(joinpath(@__DIR__, "bridges"); join = true)
-    include(filename)
+    if endswith(filename, ".jl")
+        include(filename)
+    end
 end
 
 """