*/*: remove empty global variable assigment

Signed-off-by: Julien Roy <julien@jroy.ca>

media-plugins/argotlunar-bin/argotlunar-bin-2.06-r1.ebuild

@@ -7,7 +7,6 @@ DESCRIPTION="Argotlunar is a sound granulator. Binary Linux VST"
 HOMEPAGE="https://mourednik.github.io/argotlunar/"
 SLOT="0"
 KEYWORDS="~amd64"
-IUSE=""
 
 QA_PRESTRIPPED="/usr/lib64/vst/${PN}/argotlunar.so"
 SRC_URI="https://www.dropbox.com/s/fwtg6jfkzakj7is/argotlunar-2.06-linux_64.tar.gz -> ${P}.tar.gz"

media-plugins/gimp-avif-plugin/gimp-avif-plugin-9999.ebuild

@@ -9,16 +9,13 @@ DESCRIPTION="Plug-in for development GIMP 2.99.11 for loading/saving AVIF images
 HOMEPAGE="https://github.com/novomesk/gimp-avif-plugin"
 
 EGIT_REPO_URI="https://github.com/novomesk/gimp-avif-plugin.git"
-KEYWORDS=""
 
 LICENSE="GPL-3"
 SLOT="0"
-IUSE=""
 
 DEPEND=">=media-gfx/gimp-2.99.11
 	>=media-libs/gexiv2-0.12.2
 "
 
-BDEPEND=""
 
 RDEPEND="${DEPEND}"

media-plugins/qt-jpegxl-image-plugin/qt-jpegxl-image-plugin-9999.ebuild

@@ -10,10 +10,8 @@ HOMEPAGE="https://github.com/novomesk/qt-jpegxl-image-plugin"
 
 EGIT_REPO_URI="https://github.com/novomesk/qt-jpegxl-image-plugin.git"
 
-KEYWORDS=""
 LICENSE="GPL-3"
 SLOT="0"
-IUSE=""
 
 DEPEND=">=dev-qt/qtgui-5.14.0:5
 	>=media-libs/libjxl-0.7.0_pre20220311

media-plugins/whysynth/whysynth-20170701_p20180323.ebuild

@@ -13,7 +13,6 @@ SRC_URI="https://github.com/smbolton/${PN}/archive/${WHYSYNTH_COMMIT}.tar.gz ->
 LICENSE="GPL-2"
 SLOT="0"
 KEYWORDS="~amd64 ~ppc ~ppc64 ~x86"
-IUSE=""
 
 DEPEND="media-libs/dssi
 	media-libs/liblo