Add the `dont_skip` attribute on dependency.

Instead of explicitly add the target associated to the toolchain
if we use `build_nodeps` option let add an attribute base ourself on it
to know if we need to add it or not.

This way, we may have other dependency we must not skip.

kiwixbuild/builder.py

@@ -34,14 +34,10 @@ class Builder:
 
         if option('build_nodeps'):
             # add all platform steps
-            for pltName in PlatformInfo.all_running_platforms:
-                plt = PlatformInfo.all_platforms[pltName]
-                for tlcName in plt.toolchain_names:
-                    tlc = Dependency.all_deps[tlcName]
-                    src_plt_step = ('source', tlcName)
-                    add_target_step(src_plt_step, self._targets[src_plt_step])
-                    blt_plt_step = ('neutral' if tlc.neutral else pltName, tlcName)
-                    add_target_step(blt_plt_step, self._targets[blt_plt_step])
+            for dep in steps:
+                stepClass = Dependency.all_deps[dep[1]]
+                if stepClass.dont_skip:
+                    add_target_step(dep, self._targets[dep])
 
             src_targetDef = ('source', targetDef[1])
             add_target_step(src_targetDef, self._targets[src_targetDef])

kiwixbuild/dependencies/android_ndk.py

@@ -6,6 +6,7 @@ from kiwixbuild.utils import Remotefile, add_execution_right, run_command
 pj = os.path.join
 
 class android_ndk(Dependency):
+    dont_skip = True
     neutral = False
     name = 'android-ndk'
     gccver = '4.9.x'

kiwixbuild/dependencies/android_sdk.py

@@ -7,6 +7,7 @@ from kiwixbuild.utils import Remotefile, run_command
 pj = os.path.join
 
 class android_sdk(Dependency):
+    dont_skip = True
     neutral = True
     name = 'android-sdk'
 

kiwixbuild/dependencies/armhf.py

@@ -2,6 +2,7 @@ from .base import Dependency, ReleaseDownload, NoopBuilder
 from kiwixbuild.utils import Remotefile
 
 class armhf_toolchain(Dependency):
+    dont_skip = True
     neutral = True
     name = 'armhf'
 

kiwixbuild/dependencies/base.py

@@ -23,6 +23,7 @@ class Dependency(metaclass=_MetaDependency):
     all_deps = {}
     force_build = False
     force_native_build = False
+    dont_skip = False
 
     @classmethod
     def version(cls):