base64: Migrate over to osmocom

This containts the osmocom changes to the mbedtls base64 code
merged in the previous commit.

Change-Id: I82c1bf5f827c8def370dbcb80b146e9e4184c4a3
diff --git a/tests/testsuite.at b/tests/testsuite.at
index cb84229..6ac5970 100644
--- a/tests/testsuite.at
+++ b/tests/testsuite.at
@@ -446,3 +446,9 @@
 cat $abs_srcdir/it_q/it_q_test.ok > expout
 AT_CHECK([$abs_top_builddir/tests/it_q/it_q_test], [0], [expout], [ignore])
 AT_CLEANUP
+
+AT_SETUP([base64])
+AT_KEYWORDS([base64])
+cat $abs_srcdir/base64/base64_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/base64/base64_test], [0], [expout], [ignore])
+AT_CLEANUP