valgrind: silence curl_global_init leaks

==18109== 664 bytes in 1 blocks are still reachable in loss record 279 of 339
==18109==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==18109==    by 0x675B120: ??? (in /lib/x86_64-linux-gnu/libgcrypt.so.11.8.2)
==18109==    by 0x675C13C: ??? (in /lib/x86_64-linux-gnu/libgcrypt.so.11.8.2)
==18109==    by 0x675C296: ??? (in /lib/x86_64-linux-gnu/libgcrypt.so.11.8.2)
==18109==    by 0x679BD14: ??? (in /lib/x86_64-linux-gnu/libgcrypt.so.11.8.2)
==18109==    by 0x679CC64: ??? (in /lib/x86_64-linux-gnu/libgcrypt.so.11.8.2)
==18109==    by 0x6A64946: ??? (in /usr/lib/x86_64-linux-gnu/libgnutls.so.26.22.6)
==18109==    by 0x6A116E8: ??? (in /usr/lib/x86_64-linux-gnu/libgnutls.so.26.22.6)
==18109==    by 0x6A01114: gnutls_global_init (in /usr/lib/x86_64-linux-gnu/libgnutls.so.26.22.6)
==18109==    by 0x52A6C78: ??? (in /usr/lib/x86_64-linux-gnu/libcurl-gnutls.so.4.3.0)
==18109==    by 0x5285ADC: curl_global_init (in /usr/lib/x86_64-linux-gnu/libcurl-gnutls.so.4.3.0)
==18109==    by 0x663524: git_curl_stream_global_init (curl.c:44)

libgit2_clar.supp

@@ -47,3 +47,10 @@
 	...
 	fun:__check_pf
 }
+
+{
+	ignore-curl-global-init
+	Memcheck:Leak
+	...
+	fun:curl_global_init
+}