java/icedtea-web: allow to disable new launchers written in Rust

Even it's a build-time dependency, it's quite heavy nonetheless.
Since those new launchers are optional (traditional shell-based
versions are still provided), allow users to turn them off.

Reported by:	Vyacheslav Olkhovchenkov

java/icedtea-web/Makefile

@@ -11,7 +11,6 @@ COMMENT=	Free Java plug-in and Java Web Start for OpenJDK
 LICENSE=	GPLv2
 
 BUILD_DEPENDS=	zip:archivers/zip \
-		rustc:lang/${RUST_DEFAULT} \
 		bash:shells/bash \
 		gsed:textproc/gsed \
 		${HAMCREST_JAR}:java/hamcrest \
@@ -53,12 +52,13 @@ TEST_TARGET=	check
 # Upstream archive contains files with UTF-8 names
 EXTRACT_CMD=	${SETENV} LC_ALL=en_US.UTF-8 /usr/bin/bsdtar
 
-OPTIONS_DEFINE=	DOCS PLUGIN RHINO TAGSOUP
-OPTIONS_DEFAULT=PLUGIN
+OPTIONS_DEFINE=	DOCS PLUGIN RHINO RUST TAGSOUP
+OPTIONS_DEFAULT=PLUGIN RUST
 OPTIONS_SUB=	yes
 
 PLUGIN_DESC=	Enable the browser plug-in
 RHINO_DESC=	Add support for Proxy Auto Config files
+RUST_DESC=	Build modern launchers written in Rust
 TAGSOUP_DESC=	Enable cleaning up of malformed JNLP files
 
 DOCS_CONFIGURE_ENABLE=	docs
@@ -69,6 +69,8 @@ RHINO_RUN_DEPENDS=	${RHINO_BUILD_DEPENDS}
 RHINO_VARS=		RHINO_JAR="${JAVASHAREDIR}/rhino/rhino.jar"
 RHINO_VARS_OFF=		RHINO_JAR=no
 
+RUST_BUILD_DEPENDS=	rustc:lang/${RUST_DEFAULT}
+
 TAGSOUP_BUILD_DEPENDS=	${JAVALIBDIR}/tagsoup.jar:textproc/tagsoup
 TAGSOUP_RUN_DEPENDS=	${TAGSOUP_BUILD_DEPENDS}
 TAGSOUP_VARS=		TAGSOUP_JAR="${JAVALIBDIR}/tagsoup.jar"

java/icedtea-web/pkg-plist

@@ -1,9 +1,9 @@
 bin/itw-modularjdk.args
-bin/itweb-javaws
+%%RUST%%bin/itweb-javaws
 bin/itweb-javaws.sh
-bin/itweb-policyeditor
+%%RUST%%bin/itweb-policyeditor
 bin/itweb-policyeditor.sh
-bin/itweb-settings
+%%RUST%%bin/itweb-settings
 bin/itweb-settings.sh
 %%PLUGIN%%%%WEBPLUGIN_DIR%%/IcedTeaPlugin.so
 etc/bash_completion.d/itweb-settings.bash