internal/rosa/ninja: bootstrap with verbose output

This otherwise outputs nothing, and appears to hang until the (fully single-threaded) bootstrap completes.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/ninja.go

@@ -13,6 +13,7 @@ func (t Toolchain) newNinja() (pkg.Artifact, string) {
 	}, nil, nil, `
 cd "$(mktemp -d)"
 python3 /usr/src/ninja/configure.py \
+	--verbose \
 	--bootstrap \
 	--gtest-source-dir=/usr/src/googletest
 ./ninja `+jobsFlagE+` all