tree-wide: remove unused variables

./mesonbuild/scripts/regen_checker.py:35:5: F841 local variable 'scriptdir' is assigned to but never used
    scriptdir = os.path.split(__file__)[0]
    ^
./mesonbuild/scripts/yelphelper.py:84:13: F841 local variable 'symfile' is assigned to but never used
            symfile = os.path.join(install_dir, m)
            ^
./mesonbuild/backend/backends.py:164:13: F841 local variable 'lang' is assigned to but never used
            lang = comp.get_language()
            ^
./mesonbuild/backend/ninjabackend.py:1286:9: F841 local variable 'scriptdir' is assigned to but never used
        scriptdir = self.environment.get_script_dir()
        ^
./mesonbuild/backend/vs2010backend.py:736:9: F841 local variable 'additional_options_set' is assigned to but never used
        additional_options_set = True
        ^

Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>

mesonbuild/backend/backends.py

@@ -161,7 +161,6 @@ class Backend():
 
         # For each language, generate a unity source file and return the list
         for comp, srcs in compsrcs.items():
-            lang = comp.get_language()
             with init_language_file(comp.get_default_suffix()) as ofile:
                 for src in srcs:
                     ofile.write('#include<%s>\n' % src)

mesonbuild/backend/ninjabackend.py

@@ -1283,7 +1283,6 @@ int dummy;
                 outfile.write(command)
                 outfile.write(description)
                 outfile.write('\n')
-        scriptdir = self.environment.get_script_dir()
         outfile.write('\n')
         symrule = 'rule SHSYM\n'
         symcmd = ' command = "%s" "%s" %s %s %s %s $CROSS\n' % (ninja_quote(sys.executable),

mesonbuild/backend/vs2010backend.py

@@ -733,7 +733,6 @@ class Vs2010Backend(backends.Backend):
         if len(target_args) > 0:
             target_args.append('%(AdditionalOptions)')
             ET.SubElement(clconf, "AdditionalOptions").text = ' '.join(target_args)
-        additional_options_set = True
 
         for d in target.include_dirs:
             for i in d.incdirs:

mesonbuild/scripts/regen_checker.py

@@ -32,7 +32,6 @@ def need_regen(regeninfo, regen_timestamp):
     return False
 
 def regen(regeninfo, mesonscript, backend):
-    scriptdir = os.path.split(__file__)[0]
     cmd = [sys.executable,
            mesonscript,
            '--internal',

mesonbuild/scripts/yelphelper.py

@@ -81,7 +81,6 @@ def install_help(srcdir, blddir, sources, media, langs, install_dir, destdir, pr
                         os.makedirs(os.path.dirname(outfile), exist_ok=True)
                     os.symlink(srcfile, outfile)
                 continue
-            symfile = os.path.join(install_dir, m)
             mlog.log('Installing %s to %s.' %(infile, outfile))
             if '/' in m or '\\' in m:
                 os.makedirs(os.path.dirname(outfile), exist_ok=True)