Pass -rpath to linker only, not to compiler

theano/sandbox/cuda/__init__.py

@@ -362,9 +362,6 @@ class DnnVersion(GpuOp):
     def c_lib_dirs(self):
         return [config.dnn.library_path]
 
-    def c_compile_args(self):
-        return ['-rpath', config.dnn.library_path]
-
     def c_support_code(self):
         return """
 #if PY_MAJOR_VERSION >= 3

theano/sandbox/cuda/dnn.py

@@ -94,9 +94,6 @@ class DnnBase(GpuOp, COp):
     def c_lib_dirs(self):
         return [config.dnn.library_path]
 
-    def c_compile_args(self):
-        return ['-rpath', config.dnn.library_path]
-
 
 class GpuDnnConvDesc(GpuOp):
     """

theano/sandbox/cuda/nvcc_compiler.py

@@ -55,7 +55,7 @@ def is_nvcc_available():
             return False
 
 
-rpath_defaults = []
+rpath_defaults = [config.dnn.library_path]
 
 
 def add_standard_rpath(rpath):