This needs to be a install-data-hook not an install-exec-hook as the helpers are
installed into helperdir which is considered data (only path variables with
"exec" in are considered executables).

The explicit dependency on install-helpersPROGRAMS was an attempt at solving
this, but this causes occasional races where install-helpersPROGRAMS can run
twice in parallel (once via install-all, once via the hook's dependency).

Upstream-Status: Backport [09aa20746a0fef97fb811c5503928c13a1f55eb5]
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/libs/gst/helpers/Makefile.am b/libs/gst/helpers/Makefile.am
index 0ae9ab0..2530a34 100644
--- a/libs/gst/helpers/Makefile.am
+++ b/libs/gst/helpers/Makefile.am
@@ -23,7 +23,7 @@ gst_ptp_helper_CFLAGS = $(GST_OBJ_CFLAGS) $(GIO_CFLAGS)
 gst_ptp_helper_LDADD = $(GST_OBJ_LIBS) $(GIO_LIBS) $(CAP_LIBS)
 endif
 
-install-exec-hook: install-helpersPROGRAMS
+install-data-hook:
 if HAVE_PTP
 if HAVE_PTP_HELPER_SETUID
 	- chown root $(DESTDIR)$(helpersdir)/gst-ptp-helper