Log Message:
libidn: update to 1.34.

* Version 1.34 (2018-03-31)

** libidn: Fix integer overflow in combine_hangul()
   Found by fuzzing.

** libidn: Fix integer overflow in punycode decoder
   Found by fuzzing, fix for the fix reported by Christian Weisgerber

** libidn: Fix performance issue in idna_to_unicode_internal()
   Found by fuzzing.

** libidn: Fix performance issue in stringprep functions.
   Found by fuzzing.

** libidn: Fix NULL pointer dereference in g_utf8_normalize()
   Found by fuzzing.

** libidn: Fix NULL pointer dereference in stringprep_ucs4_nfkc_normalize()
   Found by fuzzing.

** libidn: Increase performance of stringprep functions
   Found by fuzzing.

** testing: Add OSS-fuzz integration and regression testing

** build: Update gnulib files

** build: Modernize GTK-Doc build

** build: Fix parallel builds

** build: Add configure flag --disable-doc

** build: Add configure flag --enable-ubsan (enable UB Sanitizer)

** build: Add configure flag --enable-asan (enable Address Sanitizer)

** build: Fix compiler warnings

** build: Fix build for gcc-7

** i18n: Added Swedish translation.
   Thanks to Josef Andersson.

** API and ABI is backwards compatible with the previous version.