scons: ignore .hpp files in parse_source_list()

Drivers that contain C++ .hpp files need to ignore them too, along
with .h files, when building source file lists.

Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

scons/custom.py

@@ -281,7 +281,7 @@ def parse_source_list(env, filename, names=None):
                     # cause duplicate actions.
                     f = f[len(cur_srcdir + '/'):]
                 # do not include any headers
-                if f.endswith('.h'):
+                if f.endswith(tuple(['.h','.hpp'])):
                     continue
                 srcs.append(f)