doc: move text describing --trace to specific .texi file

This text will be included to qemu-nbd/qemu-img mans in the next patches.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1466174654-30130-3-git-send-email-den@openvz.org
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/Makefile b/Makefile
index 7087fc2..b72093f 100644
--- a/Makefile
+++ b/Makefile
@@ -564,6 +564,7 @@
 	  perl -Ww -- $(SRC_PATH)/scripts/texi2pod.pl $< qemu.pod && \
 	  $(POD2MAN) --section=1 --center=" " --release=" " qemu.pod > $@, \
 	  "  GEN   $@")
+qemu.1: qemu-option-trace.texi
 
 qemu-img.1: qemu-img.texi qemu-img-cmds.texi
 	$(call quiet-command, \
@@ -595,7 +596,7 @@
 pdf: qemu-doc.pdf qemu-tech.pdf
 
 qemu-doc.dvi qemu-doc.html qemu-doc.info qemu-doc.pdf: \
-	qemu-img.texi qemu-nbd.texi qemu-options.texi \
+	qemu-img.texi qemu-nbd.texi qemu-options.texi qemu-option-trace.texi \
 	qemu-monitor.texi qemu-img-cmds.texi qemu-ga.texi \
 	qemu-monitor-info.texi