dev-java/icedtea: Disable ccache unconditionally as it always breaks

Closes: https://bugs.gentoo.org/624230
Package-Manager: Portage-2.3.41, Repoman-2.3.9

dev-java/icedtea/icedtea-3.8.0.ebuild

@@ -294,14 +294,6 @@ src_configure() {
 		zero_config="--enable-zero"
 	fi
 
-	# Warn about potential problems with ccache enabled
-	if has ccache ${FEATURES}; then
-		ewarn 'ccache has been known to break IcedTea. Disable it before filing bugs.'
-		config+=" --enable-ccache"
-	else
-		config+=" --disable-ccache"
-	fi
-
 	# PaX breaks pch, bug #601016
 	if use pch && ! host-is-pax; then
 		config+=" --enable-precompiled-headers"
@@ -329,6 +321,7 @@ src_configure() {
 		--docdir="${EPREFIX}/usr/share/doc/${PF}" \
 		--htmldir="${EPREFIX}/usr/share/doc/${PF}/html" \
 		--with-pkgversion="Gentoo ${PF}" \
+		--disable-ccache \
 		--disable-downloading --disable-Werror --disable-tests \
 		--disable-systemtap-tests --enable-improved-font-rendering \
 		--enable-system-jpeg --enable-system-zlib \