* gnu/packages/make-bootstrap.scm (gcc-for-bootstrap)[Inherit]: Inherit
from gcc-7.
[inputs]: Use package-inputs from gcc-7.
(package-with-relocatable-glibc)[native-inputs]: Have cross-gcc use
gcc-7.
(%gcc-static)[inherit]: Inherit from gcc-7.
[arguments]: Use package-arguments from gcc-7.
[inputs]: Replace isl-0.18 with isl. Use package-inputs from gcc-7.
[native-inputs]: Use package-native-inputs from gcc-7.
(%gcc-stripped)[inherit]: Inherit from gcc-7.
f819b46acb