tzcode-native: Fix compiler setting from 2023d version

Starting from 2023d version, tzcode makefile does not use anymore "cc"
variable for C compiler, due to Makefile refactoring.
Replacing "cc" with "CC" fixes the issue.

(From OE-Core rev: 7adb3079430af789f73550eba2da2495b30e78a4)

Signed-off-by: Alessio Cascone <alessio.cascone@vimar.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit b3cdfca5ef84ed2054faef9abddef3aeed930e17)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-extended/timezone/tzcode-native.bb

@@ -4,7 +4,7 @@ SUMMARY = "tzcode, timezone zoneinfo utils -- zic, zdump, tzselect"
 
 inherit native
 
-EXTRA_OEMAKE += "cc='${CC}'"
+EXTRA_OEMAKE += "CC='${CC}'"
 
 do_install () {
         install -d ${D}${bindir}/