packaging: rhel8 needs json-cpp and up-to-date gnutls

add BuildRequires jsoncpp-devel to the spec files, otherwise
buliding RPM packages for RHEL 8 fails with this message

contrib/x86_64-redhat-linux checking for Jsoncpp... yes
checking for ZLIB... yes checking for PJPROJECT... no
configure: error: Missing pjproject files error: Bad exit status ...

Add '.gnutls' after 'make -j4 V=1 .ffmpeg' in the spec file
if we don't compile GnuTLS Jami is unable to establish p2p communication

Error message in dring when using RHEL8's GnuTLS version 3.6.8
[TLS] handshake failed: An error has been detected in the library and cannot
continue operations.

Change-Id: Ic8c500eaa286d66f251588f8052267d0bfc3240f

packaging/rules/rhel/jami-one-click.spec

@@ -40,8 +40,7 @@ BuildRequires: libuuid-devel
 BuildRequires: libXfixes-devel
 BuildRequires: gnutls-devel
 BuildRequires: nettle-devel
-#BuildRequires: jsoncpp-devel
-#BuildRequires: json-devel
+BuildRequires: jsoncpp-devel
 BuildRequires: gcc-c++
 BuildRequires: glib2-devel
 BuildRequires: gtk3-devel
@@ -94,7 +93,7 @@ cd %{_builddir}/ring-project/daemon/contrib/native && \
     make list && \
     make fetch && \
     make -j4 V=1 && \
-    make -j4 V=1 .ffmpeg
+    make -j4 V=1 .ffmpeg .gnutls
 
 cd %{_builddir}/ring-project/daemon && \
     ./autogen.sh && \

packaging/rules/rhel/jami.spec

@@ -41,8 +41,7 @@ BuildRequires: libuuid-devel
 BuildRequires: libXfixes-devel
 BuildRequires: gnutls-devel
 BuildRequires: nettle-devel
-#BuildRequires: jsoncpp-devel
-#BuildRequires: json-devel
+BuildRequires: jsoncpp-devel
 BuildRequires: gcc-c++
 BuildRequires: glib2-devel
 BuildRequires: gtk3-devel
@@ -113,7 +112,7 @@ cd %{_builddir}/ring-project/daemon/contrib/native && \
     make list && \
     make fetch && \
     make -j4 V=1 && \
-    make -j4 V=1 .ffmpeg
+    make -j4 V=1 .ffmpeg .gnutls
 
 cd %{_builddir}/ring-project/daemon && \
     ./autogen.sh && \