toolchain/toolchain-external/toolchain-external-synopsys-arc: fix condition
The option BR2_TOOLCHAIN_EXTERNAL_SYNOPSYS_ARC just depends on
BR2_arc, but the choice of toolchains that appears once
BR2_TOOLCHAIN_EXTERNAL_SYNOPSYS_ARC=y only has choices for:
depends on BR2_arc750d || BR2_arc770d
and
depends on BR2_archs38_64mpy || BR2_archs38_full || \
BR2_archs4x_rel31 || BR2_archs4x
which means that if you have a BR2_archs38=y configuration, you end up
with no choice of toolchain, and the build fails with "No C library
selected". Fix this by making sure BR2_TOOLCHAIN_EXTERNAL_SYNOPSYS_ARC
can only be selected when an actual toolchain is available.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>
Thomas Petazzoni