[Buildroot] [git commit branch/2025.08.x] package/gnuplot: fix deprecated CPE

[Thomas Perale]

commit: https://git.buildroot.net/buildroot/commit/?id=b20a5a44692ea5756859bff5cc5c7e64a67841d5
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2025.08.x

The CPE 'gnuplot_project:gnuplot' has been deprecated in favour of
'gnuplot:gnuplot'.

See the following:
  - https://nvd.nist.gov/products/cpe/detail/DB68C9F5-3330-4749-A6F5-61FF041037CC
  - https://nvd.nist.gov/vuln/detail/cve-2025-31178

Signed-off-by: Thomas Perale <thomas.perale at mind.be>
Signed-off-by: Julien Olivain <ju.o at free.fr>
(cherry picked from commit 0bbefd60f7192c6b13c571ce144f8518de5ec538)
Signed-off-by: Thomas Perale <thomas.perale at mind.be>
---
 package/gnuplot/gnuplot.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/gnuplot/gnuplot.mk b/package/gnuplot/gnuplot.mk
index 2a1072a55c..efdc08deae 100644
--- a/package/gnuplot/gnuplot.mk
+++ b/package/gnuplot/gnuplot.mk
@@ -8,7 +8,7 @@ GNUPLOT_VERSION = 6.0.3
 GNUPLOT_SITE = http://downloads.sourceforge.net/project/gnuplot/gnuplot/$(GNUPLOT_VERSION)
 GNUPLOT_LICENSE = gnuplot license (open source)
 GNUPLOT_LICENSE_FILES = Copyright
-GNUPLOT_CPE_ID_VALID = YES
+GNUPLOT_CPE_ID_VENDOR = gnuplot
 
 GNUPLOT_AUTORECONF = YES