Merge pull request #1143 in FS/freeswitch from ~SAFAROV/freeswitch2:FS-9924 to master

%backport=1.6

* commit '392f0956':
  FS-9924: Removed libvpx dependency from SPEC file.

freeswitch.spec

@@ -190,7 +190,6 @@ BuildRequires: ilbc2-devel
 BuildRequires: g722_1-devel
 BuildRequires: libcodec2-devel
 BuildRequires: libsilk-devel
-BuildRequires: libvpx2-devel >= 2.0.0
 BuildRequires: libyuv-devel >= 0.0.1280
 BuildRequires: lua-devel
 BuildRequires: mongo-c-driver-devel