dev-java/jna: correct package phase for variable definition

Setting EANT_GENTOO_CLASSPATH_EXTRA in pkg_setup() causes binary
packages to die when being emerged. We set the variable by calling
java-pkg_getjars with jna build-only dependencies as argument, which
will not be available if a binary package is emerged.

Instead those variables, which are only needed when the package is
compiled, should be set in src_prepare().

Thanks to zorry for reporting this.

Signed-off-by: Florian Schmaus <flow@gentoo.org>
Reported-by: Magnus Granberg <zorry@gentoo.org>

dev-java/jna/jna-5.11.0-r1.ebuild

@@ -56,8 +56,8 @@ EANT_EXTRA_ARGS="-Dbuild-native=true -Dcompatibility=1.8 -Ddynlink.native=true"
 EANT_TEST_EXTRA_ARGS="-Djava.io.tmpdir=\"${T}\""
 EANT_TEST_GENTOO_CLASSPATH="animal-sniffer-annotations,reflections"
 
-pkg_setup() {
-	java-pkg-2_pkg_setup
+src_prepare() {
+	default
 
 	EANT_GENTOO_CLASSPATH_EXTRA="$(java-pkg_getjars --build-only \
 		animal-sniffer-annotations,ant-core,asm-9)"
@@ -68,10 +68,6 @@ pkg_setup() {
 	ANT_OPTS="-DCC='$(tc-getCC)' -DSTRIP='$(tc-getSTRIP)'"
 	# Parallel build does not respect dependency relationships between objects
 	ANT_OPTS+=" -DEXTRA_MAKE_OPTS='${MAKEOPTS} -j1'"
-}
-
-src_prepare() {
-	default
 
 	# Eliminate build.xml's dependency on bundled native JARs
 	sed -i -e '/zipfileset src="${lib.native}/,+2d' build.xml ||