package: drop _CPE_ID_VALID, use _CPE_ID_VENDOR

FOO_CPE_ID_VALID really ought to be an internal implementaion detail.
Packages that really want to trigger their CPE defintitions really
should set one of the actual variables to a meaningful value.

There are two CPE-related variables that we could chose to set to
replace FOO_CPE_ID_VALID: FOO_CPE_ID_VENDOR and FOO_CPE_ID_PRODUCT.
Between those two, _VENDOR more often diverges from the default than
_PRODUCT does, so that's what we use.

    ---8<------8<------8<------8<------8<---
    #!/bin/bash
    # Replace FOO_CPE_ID_VALID = YES with FOO_CPE_ID_VENDOR = foo_project
    for i in $(git grep -l -E '[^)]_CPE_ID_VALID = YES' package support); do
        pkg="$(basename "${i%/*}")"
        sed -r -i -e "s/_CPE_ID_VALID = YES/_CPE_ID_VENDOR = ${pkg}_project/" "${i}"
    done
    ---8<------8<------8<------8<------8<---

Reported-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Matthew Weber <matthew.weber@rockwellcollins.com>
Cc: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Peter: update cpe-test comment to reflect pkg3 change]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gnuplot/gnuplot.mk

@@ -8,7 +8,7 @@ GNUPLOT_VERSION = 5.4.1
 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_project
 
 GNUPLOT_AUTORECONF = YES