Currently gstreamer configuration depends on whether setcap is found on the host
system. Turn this into a configure option to make builds deterinistic.

RP 2020/2/19
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Upstream-Status: Pending

Index: gstreamer-1.16.1/libs/gst/helpers/meson.build
===================================================================
--- gstreamer-1.16.1.orig/libs/gst/helpers/meson.build
+++ gstreamer-1.16.1/libs/gst/helpers/meson.build
@@ -73,7 +73,12 @@ if have_ptp
     endif
   endif
 
-  setcap = find_program('setcap', '/usr/sbin/setcap', '/sbin/setcap', required : false)
+  setcap_feature = get_option('setcap')
+  if setcap_feature.disabled()
+    setcap = find_program('dontexist', required : false)
+  else
+    setcap = find_program('setcap', '/usr/sbin/setcap', '/sbin/setcap', required : false)
+  endif
 
   # user/group to change to in gst-ptp-helper
   ptp_helper_setuid_user = get_option('ptp-helper-setuid-user')
Index: gstreamer-1.16.1/meson_options.txt
===================================================================
--- gstreamer-1.16.1.orig/meson_options.txt
+++ gstreamer-1.16.1/meson_options.txt
@@ -26,6 +26,7 @@ option('libunwind', type : 'feature', va
 option('libdw', type : 'feature', value : 'auto', description : 'Use libdw to generate better backtraces from libunwind')
 option('dbghelp', type : 'feature', value : 'auto', description : 'Use dbghelp to generate backtraces')
 option('bash-completion', type : 'feature', value : 'auto', description : 'Install bash completion files')
+option('setcap', type : 'feature', value : 'auto', description : 'Use setcap')
 
 # Common feature options
 option('examples', type : 'feature', value : 'auto', yield : true)