pylibfdt: We don't need include files from the base directory

pylibfdt/setup.py currently adds include flags to the extension module
build to allow include files in the base dtc directory.  But pylibfdt
doesn't rely on any headers there, only on headers in libfdt/ - it also
shouldn't rely on dtc headers at any future time.

So, remove that from the include list, allowing some simplifications to
setup.py.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Simon Glass <sjg@chromium.org>

pylibfdt/setup.py

@@ -70,14 +70,12 @@ def GetEnvFromMakefiles():
 
     Returns:
         Tuple with:
-            List of swig options
             Version string
             List of files to build
             List of extra C preprocessor flags needed
             Object directory to use (always '')
     """
     basedir = os.path.dirname(os.path.dirname(os.path.abspath(sys.argv[0])))
-    swig_opts = ['-I%s' % basedir]
     makevars = ParseMakefile(os.path.join(basedir, 'Makefile'))
     version = '%s.%s.%s' % (makevars['VERSION'], makevars['PATCHLEVEL'],
                             makevars['SUBLEVEL'])
@@ -85,9 +83,9 @@ def GetEnvFromMakefiles():
     files = makevars['LIBFDT_SRCS'].split()
     files = [os.path.join(basedir, 'libfdt', fname) for fname in files]
     files.append('pylibfdt/libfdt.i')
-    cflags = ['-I%s' % basedir, '-I%s/libfdt' % basedir]
+    cflags = ['-I%s/libfdt' % basedir]
     objdir = ''
-    return swig_opts, version, files, cflags, objdir
+    return  version, files, cflags, objdir
 
 
 progname = sys.argv[0]
@@ -95,19 +93,17 @@ files = os.environ.get('SOURCES', '').split()
 cflags = os.environ.get('CPPFLAGS', '').split()
 objdir = os.environ.get('OBJDIR')
 version = os.environ.get('VERSION')
-swig_opts = []
 
 # If we were called directly rather than through our Makefile (which is often
 # the case with Python module installation), read the settings from the
 # Makefile.
 if not all((version, files, cflags, objdir)):
-    swig_opts, version, files, cflags, objdir = GetEnvFromMakefiles()
+    version, files, cflags, objdir = GetEnvFromMakefiles()
 
 libfdt_module = Extension(
     '_libfdt',
     sources = files,
     extra_compile_args = cflags,
-    swig_opts = swig_opts,
 )
 
 setup(