[build] Fixed build break for OCaml bindings.

After r273302 LLVM_SYSTEM_LIBS may have entries that already have
-l prefix and we need to deal with that.

llvm-svn: 273333

llvm/cmake/modules/AddOCaml.cmake

@@ -73,7 +73,13 @@ function(add_ocaml_library name)
 
   get_property(system_libs TARGET LLVMSupport PROPERTY LLVM_SYSTEM_LIBS)
   foreach(system_lib ${system_libs})
-    list(APPEND ocaml_flags "-l${system_lib}" )
+    if (system_lib MATCHES "^-")
+      # If it's an option, pass it without changes.
+      list(APPEND ocaml_flags "${system_lib}" )
+    else()
+      # Otherwise assume it's a library name we need to link with.
+      list(APPEND ocaml_flags "-l${system_lib}" )
+    endif()
   endforeach()
 
   string(REPLACE ";" " " ARG_CFLAGS "${ARG_CFLAGS}")