libgpiod: Detect ptest using PTEST_ENABLED

Allow the ptest packages to be disabled even if ptest is enabled in
DISTRO_FEATURES.

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/libgpiod/libgpiod_1.6.3.bb

@@ -19,7 +19,8 @@ PACKAGECONFIG[cxx] = "--enable-bindings-cxx,--disable-bindings-cxx"
 PACKAGECONFIG[python3] = "--enable-bindings-python,--disable-bindings-python,python3"
 
 # Enable cxx bindings by default.
-PACKAGECONFIG ?= "cxx"
+PACKAGECONFIG ?= "cxx \
+		  ${@bb.utils.contains('PTEST_ENABLED', '1', 'tests', '', d)}"
 
 # Always build tools - they don't have any additional
 # requirements over the library.
@@ -56,8 +57,6 @@ RRECOMMENDS:${PN}-ptest += " \
 "
 RDEPENDS:${PN}-ptest += "bats python3-packaging"
 
-PACKAGECONFIG:append = " ${@bb.utils.contains('DISTRO_FEATURES', 'ptest', 'tests', '', d)}"
-
 do_install_ptest() {
     install -d ${D}${PTEST_PATH}/tests