Remove duplicate manpage entries from Makefile.

--- gnutls-3.4.0/doc/manpages/Makefile.am.orig	2015-04-06 04:48:30.000000000 -0400
+++ gnutls-3.4.0/doc/manpages/Makefile.am	2015-04-12 16:52:58.029694525 -0400
@@ -134,11 +134,8 @@
 APIMANS += gnutls_certificate_get_peers_subkey_id.3
 APIMANS += gnutls_certificate_get_trust_list.3
 APIMANS += gnutls_certificate_get_verify_flags.3
-APIMANS += gnutls_certificate_get_verify_flags.3
-APIMANS += gnutls_certificate_get_x509_crt.3
 APIMANS += gnutls_certificate_get_x509_crt.3
 APIMANS += gnutls_certificate_get_x509_key.3
-APIMANS += gnutls_certificate_get_x509_key.3
 APIMANS += gnutls_certificate_send_x509_rdn_sequence.3
 APIMANS += gnutls_certificate_server_set_request.3
 APIMANS += gnutls_certificate_set_dh_params.3
--- gnutls-3.4.0/doc/manpages/Makefile.in.orig	2015-04-08 02:08:30.000000000 -0400
+++ gnutls-3.4.0/doc/manpages/Makefile.in	2015-04-12 16:53:13.319694530 -0400
@@ -1275,11 +1275,8 @@
 	gnutls_certificate_get_peers_subkey_id.3 \
 	gnutls_certificate_get_trust_list.3 \
 	gnutls_certificate_get_verify_flags.3 \
-	gnutls_certificate_get_verify_flags.3 \
-	gnutls_certificate_get_x509_crt.3 \
 	gnutls_certificate_get_x509_crt.3 \
 	gnutls_certificate_get_x509_key.3 \
-	gnutls_certificate_get_x509_key.3 \
 	gnutls_certificate_send_x509_rdn_sequence.3 \
 	gnutls_certificate_server_set_request.3 \
 	gnutls_certificate_set_dh_params.3 \
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<div class='path'>path: <a href='/guix/log/?id=ea0a51071e68c37a4c9c25421cf03bc2f442c67b'>root</a>/<a href='/guix/log/gnu?id=ea0a51071e68c37a4c9c25421cf03bc2f442c67b'>gnu</a>/<a href='/guix/log/gnu/packages?id=ea0a51071e68c37a4c9c25421cf03bc2f442c67b'>packages</a>/<a href='/guix/log/gnu/packages/syncthing.scm?id=ea0a51071e68c37a4c9c25421cf03bc2f442c67b'>syncthing.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/syncthing.scm?id=ea0a51071e68c37a4c9c25421cf03bc2f442c67b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-04-26 21:32:50 +0300'>2021-04-26</span></td><td><a href='/guix/commit/gnu/packages/syncthing.scm?id=b33f5d7ff0627424a06fd0416761cd81c350e20a'>gnu: syncthing: Prepare for cross-compiling.</a></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-04-26 21:32:49 +0300'>2021-04-26</span></td><td><a href='/guix/commit/gnu/packages/syncthing.scm?id=9c8a108186fa23cf31bf3a1a2370c4f82bdc91e3'>gnu: syncthing: Allow skipping the check phase.</a></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-04-11 21:52:34 -0400'>2021-04-11</span></td><td><a href='/guix/commit/gnu/packages/syncthing.scm?id=ed3ef756f521a0df8596a88b66f65b7a1ad99252'>gnu: Syncthing: Update to 1.15.1 [fixes CVE-2021-21404].</a></td><td>Leo Famulari</td></tr>
<tr><td><span title='2021-01-29 10:58:25 -0500'>2021-01-29</span></td><td><a href='/guix/commit/gnu/packages/syncthing.scm?id=de8dc9039b532f938074eb8504c63d3755d92eb6'>gnu: syncthing-gtk: Switch source to use Debian's Python 3 port.</a></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2020-11-19 20:48:26 +0200'>2020-11-19</span></td><td><a href='/guix/commit/gnu/packages/syncthing.scm?id=8ed4c468ab611409902c00bdf7c21fdb8d312928'>gnu: Don't append '.git' to GitHub uris.</a></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-08-30 14:45:39 +0300'>2020-08-30</span></td><td><a href='/guix/commit/gnu/packages/syncthing.scm?id=09991683370cce8792fb4e8d0013e157c803d732'>gnu: synthing-gtk: Add missing input.</a></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-07-25 18:47:55 +0200'>2020-07-25</span></td><td><a href='/guix/commit/gnu/packages/syncthing.scm?id=29b659ead373bcd02deec42275aa6cf1063bdb16'>gnu: Add syncthing-gtk.</a></td><td>Giacomo Leidi</td></tr>
<tr><td><span title='2020-07-12 23:08:15 +0200'>2020-07-12</span></td><td><a href='/guix/commit/gnu/packages/syncthing.scm?id=b0e7b6992f3f845e83cfbca4d700b51dba50b4d5'>gnu: Remove ".git" from "https://github/…/….git".</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-06-23 19:17:32 +0300'>2020-06-23</span></td><td><a href='/guix/commit/gnu/packages/syncthing.scm?id=87e1a1979b2bc0fbcd6187483d5e380e3f52d8f5'>gnu: go-github-com-rcrowley-go-metrics: Skip tests on aarch64-linux.</a></td><td>Efraim Flashner</td></tr>