crossdirect: use native ccache, fix armhf error (!1773)

Depend on new pmaports version, where crossdirect uses the native ccache
binary instead of going through the foreign arch ccache first and then
going through crossdirect.

Old:
ccache (foreign) -> crossdirect (native) -> gcc (native)

New:
crossdirect (native) -> ccache (native) -> gcc (native)

Set the PATH to the crossdirect binaries, and don't set CCACHE_PATH or
CCACHE_COMPILERCHECK from pmbootstrap anymore. crossdirect sets the
CCACHE_PATH to /native/usr/bin now, along with all other required
environment variables. CCACHE_COMPILERCHECK isn't necessary anymore,
because ccache will call gcc directly and therefore be able to use the
file's timestamp and size directly. Also passing that would not work
with the current crossdirect package.

pmb/build/_package.py

@@ -398,8 +398,8 @@ def run_abuild(args, apkbuild, arch, strict=False, force=False, cross=None,
         if args.verbose:
             env["DISTCC_VERBOSE"] = "1"
     if cross == "crossdirect":
-        env["CCACHE_PATH"] = "/native/usr/lib/crossdirect/" + arch + ":/usr/bin"
-        env["CCACHE_COMPILERCHECK"] = "string:" + get_gcc_version(args, arch)
+        env["PATH"] = ":".join(["/native/usr/lib/crossdirect/" + arch,
+                                pmb.config.chroot_path])
     if not args.ccache:
         env["CCACHE_DISABLE"] = "1"
 

pmb/config/__init__.py

@@ -40,7 +40,7 @@ apk_keys_path = pmb_src + "/pmb/data/keys"
 apk_tools_static_min_version = "2.10.3-r1"
 
 # postmarketOS aports compatibility (checked against "version" in pmaports.cfg)
-pmaports_min_version = "3"
+pmaports_min_version = "4"
 
 # Version of the work folder (as asked during 'pmbootstrap init'). Increase
 # this number, whenever migration is required and provide the migration code,