Fix things caused by the ab upgrade.

build.py

@@ -1,7 +1,7 @@
 from build.ab import export
 from build.c import clibrary, cxxlibrary
 from build.protobuf import proto, protocc
-from build.pkg import package, hostpackage
+from build.pkg import package
 from build.utils import test
 from glob import glob
 import config
@@ -12,11 +12,6 @@ package(name="z_lib", package="zlib")
 package(name="fmt_lib", package="fmt", fallback="dep/fmt")
 package(name="sqlite3_lib", package="sqlite3")
 
-hostpackage(name="protobuf_host_lib", package="protobuf")
-hostpackage(name="z_host_lib", package="zlib")
-hostpackage(name="fmt_host_lib", package="fmt", fallback="dep/fmt")
-hostpackage(name="sqlite3_host_lib", package="sqlite3")
-
 clibrary(name="protocol", hdrs={"protocol.h": "./protocol.h"})
 
 corpustests = []

dep/fmt/build.py

@@ -1,4 +1,4 @@
-from build.c import cxxlibrary, HostToolchain
+from build.c import cxxlibrary
 
 cxxlibrary(
     name="fmt",

scripts/build.py

@@ -1,5 +1,5 @@
 from build.ab import Rule, simplerule, Targets, TargetsMap
-from build.c import cxxprogram, HostToolchain
+from build.c import cxxprogram
 
 encoders = {}