Fix broken build due to C++ template behind C linkage glib/gatomic.h since 2.68 includes type_traits, which causes a compilation error: In file included from /usr/include/glib-2.0/glib/gatomic.h:31, from /usr/include/glib-2.0/glib/gthread.h:32, from /usr/include/glib-2.0/glib/gasyncqueue.h:32, from /usr/include/glib-2.0/glib.h:32, from /usr/include/libsigrokdecode/libsigrokdecode.h:25, from /home/abuild/rpmbuild/BUILD/pulseview-0.4.2/pv/data/decode/annotation.cpp:21: /usr/include/c++/10/type_traits:2308:3: error: template with C linkage 2308 | template<typename _CTp, typename _Rp>
As libsigrokdecode.h declares extern C linkage itself where necessary, remove it from pulseviews include statements from the last two occasions.
