Build dependencies update

Added 'jsoncpp' build dependency necessary since version 71

.SRCINFO

@@ -18,6 +18,7 @@ pkgbase = ungoogled-chromium
 	makedepends = llvm
 	makedepends = libva
 	makedepends = quilt
+	makedepends = jsoncpp
 	depends = gtk3
 	depends = nss
 	depends = alsa-lib

PKGBUILD

@@ -14,7 +14,7 @@ depends=('gtk3' 'nss' 'alsa-lib' 'xdg-utils' 'libxss' 'libcups' 'libgcrypt'
          'ttf-font' 'systemd' 'dbus' 'libpulse' 'pciutils' 'json-glib'
          'desktop-file-utils' 'hicolor-icon-theme')
 makedepends=('python' 'python2' 'gperf' 'yasm' 'mesa' 'ninja' 'git'
-             'clang' 'lld' 'gn' 'llvm' 'libva' 'quilt')
+             'clang' 'lld' 'gn' 'llvm' 'libva' 'quilt' 'jsoncpp')
 optdepends=('pepper-flash: support for Flash content'
             'kdialog: needed for file dialogs in KDE'
             'gnome-keyring: for storing passwords in GNOME keyring'