package/exiv2: really disable samples

EXIV2_ENABLE_BUILD_SAMPLES has been renamed into EXIV2_BUILD_SAMPLES
since version 0.27 and
https://github.com/Exiv2/exiv2/commit/60d436c96960fa314e2d12d017440253ce280d51

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 918842133127e1f95a7ba5e8832d81f439c0cff3)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/exiv2/exiv2.mk

@@ -21,7 +21,7 @@ EXIV2_IGNORE_CVES += CVE-2019-17402
 # 0002-fix_1011_jp2_readmetadata_loop.patch
 EXIV2_IGNORE_CVES += CVE-2019-20421
 
-EXIV2_CONF_OPTS += -DEXIV2_ENABLE_BUILD_SAMPLES=OFF
+EXIV2_CONF_OPTS += -DEXIV2_BUILD_SAMPLES=OFF
 
 # The following CMake variable disables a TRY_RUN call in the -pthread
 # test which is not allowed when cross-compiling.