Fix style issues.

mesonbuild/dependencies/misc.py

@@ -361,7 +361,7 @@ class BoostDependency(ExternalDependency):
         all_found = True
         for module in self.requested_modules:
             args = None
-            libname = 'boost_'+module
+            libname = 'boost_' + module
             if self.is_multithreading and not mesonlib.for_linux(self.want_cross, self.env):
                 # - Linux leaves off -mt but libraries are multithreading-aware.
                 # - Mac requires -mt for multithreading, so should not fall back to non-mt libraries.
@@ -426,9 +426,9 @@ class BoostDependency(ExternalDependency):
     def extra_lib_dirs(self):
         dirs = []
         if self.boost_root:
-            dirs= [ os.path.join(self.boost_root, 'lib')]
+            dirs = [os.path.join(self.boost_root, 'lib')]
         elif self.libdir:
-            dirs = [ self.libdir ]
+            dirs = [self.libdir]
         return dirs
 
     def get_link_args(self):