layer.conf: fixes icon-theme signature changes
layer.conf: fixes icon-theme signature changes

openzone and rodent-icon-theme are allarch but recently

gtk-icon-cache, since commit 31e3d34c8a9c3e8481aa837aa0bf52adf095fe62
[gtk-icon-cache.bbclass: add runtime dependency], it start depend on
non-allarch packages gdk-pixbuf and gtk+3, which make it's signature
changes when machine changed.

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>
Cc: Andreas Müller <d72a15aaaca3a7afa855175c72dc8d2e05931e32@gmail.com>

openembedded/meta-openembedded,moto-timo/meta-openembedded,schnitzeltony/meta-openembedded,rehsack/meta-openembedded,VCTLabs/meta-openembedded,schnitzeltony/meta-openembedded,moto-timo/meta-openembedded,schnitzeltony/meta-openembedded,rehsack/meta-openembedded,VCTLabs/meta-openembedded,VCTLabs/meta-openembedded,rehsack/meta-openembedded,openembedded/meta-openembedded,rehsack/meta-openembedded,VCTLabs/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,VCTLabs/meta-openembedded,schnitzeltony/meta-openembedded,rehsack/meta-openembedded,VCTLabs/meta-openembedded,schnitzeltony/meta-openembedded,schnitzeltony/meta-openembedded,schnitzeltony/meta-openembedded,VCTLabs/meta-openembedded,moto-timo/meta-openembedded,openembedded/meta-openembedded,rehsack/meta-openembedded,openembedded/meta-openembedded,rehsack/meta-openembedded,moto-timo/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,moto-timo/meta-openembedded,VCTLabs/meta-openembedded