Always make :Build/:BuildDir available

Don't attached this functionality to only c/cpp filetypes.

after/ftplugin/c.lua

@@ -1 +0,0 @@
-require('build').create_commands()

after/ftplugin/cpp.lua

@@ -1,4 +1,2 @@
 vim.opt.commentstring = '//%s'
 vim.opt.matchpairs:append('<:>')
-
-require('build').create_commands()

lua/build.lua

@@ -151,7 +151,6 @@ function build.list_targets()
   return targets
 end
 
-function build.create_commands()
 local buffer = vim.api.nvim_get_current_buf()
 
 -- Create :BuildDir command
@@ -167,6 +166,5 @@ function build.create_commands()
 end, {
   bang = true, nargs = '*', complete = build.list_targets,
 })
-end
 
 return build