UnicodeDecodeError when compiling volk_machine_avx2_64_mmx.c

[litmaj0r]

When compiling volk with python3, it fails due to a UnicodeDecodeError. I believe this is due to utf-8 encoding not being forced, as I was able to get this to work by modifying line 167. I'll submit a PR for this.

root@6d5f03691db3:~/sdr/src/volk/build# make
[ 2%] Generating volk_machine_avx2_64_mmx.c
Traceback (most recent call last):
File "/root/sdr/src/volk/gen/volk_tmpl_utils.py", line 31, in
import volk_kernel_defs
File "/root/sdr/src/volk/gen/volk_kernel_defs.py", line 209, in
kernels = list(map(kernel_class, kernel_files))
File "/root/sdr/src/volk/gen/volk_kernel_defs.py", line 168, in init
code = codecs.open(kernel_file, 'r').read()
File "/usr/lib/python3.5/encodings/ascii.py", line 26, in decode
return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 2460: ordinal not in range(128)
lib/CMakeFiles/volk_obj.dir/build.make:2454: recipe for target 'lib/volk_machine_avx2_64_mmx.c' failed
make[2]: *** [lib/volk_machine_avx2_64_mmx.c] Error 1
CMakeFiles/Makefile2:121: recipe for target 'lib/CMakeFiles/volk_obj.dir/all' failed
make[1]: *** [lib/CMakeFiles/volk_obj.dir/all] Error 2
Makefile:138: recipe for target 'all' failed
make: *** [all] Error 2