package/gnuplot: bump version to 5.4.9

Changelog:
http://www.gnuplot.info/ReleaseNotes_5_4_9.html

Signed-off-by: Michael Fischer <mf@go-sys.de>
[Peter: use --without-qt for consistency]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gnuplot/gnuplot.hash

@@ -1,6 +1,6 @@
-# From https://sourceforge.net/projects/gnuplot/files/gnuplot/5.4.7/
-md5  cdc9bb3ac0cc7e717246ed3df2d6ffa2  gnuplot-5.4.7.tar.gz
-sha1  6e68f94af822ff56549beab3a465c2fe976d3b34  gnuplot-5.4.7.tar.gz
+# From https://sourceforge.net/projects/gnuplot/files/gnuplot/5.4.9/
+md5  345533e461e41c263b3293f46651f0b2  gnuplot-5.4.9.tar.gz
+sha1  1a3953660656a38178ae2b368efa895af55a5001  gnuplot-5.4.9.tar.gz
 # Locally computed
-sha256  318a1501c9e659f39cf05ee5268335671bddc6c20eae06851f262fde27c2e739  gnuplot-5.4.7.tar.gz
+sha256  a328a021f53dc05459be6066020e9a71e8eab6255d3381e22696120d465c6a97  gnuplot-5.4.9.tar.gz
 sha256  895928ec0735cca1c8cec42656c7e314a065d0242813bb8693c0c1bf61fd4e4d  Copyright

package/gnuplot/gnuplot.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GNUPLOT_VERSION = 5.4.7
+GNUPLOT_VERSION = 5.4.9
 GNUPLOT_SITE = http://downloads.sourceforge.net/project/gnuplot/gnuplot/$(GNUPLOT_VERSION)
 GNUPLOT_LICENSE = gnuplot license (open source)
 GNUPLOT_LICENSE_FILES = Copyright
@@ -23,7 +23,8 @@ GNUPLOT_CONF_OPTS = \
 	--disable-wxwidgets \
 	--without-lua \
 	--without-latex \
-	--without-cairo
+	--without-cairo \
+	--without-qt
 
 # relocation truncated to fit: R_68K_GOT16O
 ifeq ($(BR2_m68k_cf),y)