spotify / spotify-qt: Add only if meta-rust is in layers

Otherwise meta-rust is a hard dependency

Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>

conf/layer.conf

@@ -6,6 +6,11 @@ BBFILES += "${LAYERDIR}/recipes-*/*.bb ${LAYERDIR}/recipes-*/*/*.bb ${LAYERDIR}/
 # appends
 BBFILES += "${LAYERDIR}/appends/*/*.bbappend"
 
+
+BBFILES_DYNAMIC += "\
+    rust-layer:${LAYERDIR}/dynamic-layers/meta-rust/*.bb \
+"
+
 BBFILE_COLLECTIONS += "meta-musicians"
 BBFILE_PATTERN_meta-musicians := "^${LAYERDIR}/"
 BBFILE_PRIORITY_meta-musicians = "20"

recipes-support/packagegroups/musicians-world.bb

@@ -192,7 +192,7 @@ RDEPENDS_${PN} += " \
     ${@bb.utils.contains("DISTRO_FEATURES", "opengl", "zyn-fusion-dssi zyn-fusion-lv2 zyn-fusion-vst zyn-fusion-standalone", "zynaddsubfx-dssi zynaddsubfx-lv2 zynaddsubfx-vst zynaddsubfx-standalone",d)} \
     \
     \
-    spotifyd spotify-qt \
+    ${@bb.utils.contains('BBFILE_COLLECTIONS', 'rust-layer', 'spotifyd spotify-qt', '', d)} \
 "