ptpd2: fix patch 0002 so that it applies properly

ptpd2: fix patch 0002 so that it applies properly

The patch
0002-ntp_isc_md5-rename-EVP_MD_CTX-into-PTPD_EVP_MD_CTX.patch added in
commit 5b7bc560a5859d4b9f0c2a14c10e83c18fbd6bca ("ptpd2: fix build
failures due to EVP_MD_CTX conflict and U64 missing") was broken and
did not apply correctly.

This commit fixes the patch so that it applies properly.

Fixes:

  http://autobuild.buildroot.net/results/ffa28ee2cecc77d66d934fdb03e1f2014189e45b/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>