Drop unused local bindings

l3build-file-functions.lua

@@ -22,7 +22,6 @@ for those people who are interested.
 
 --]]
 
-local pairs            = pairs
 local print            = print
 
 local open             = io.open
@@ -43,7 +42,6 @@ local luatex_version   = status.luatex_version
 
 local match            = string.match
 local sub              = string.sub
-local gmatch           = string.gmatch
 local gsub             = string.gsub
 
 local insert           = table.insert

l3build-install.lua

@@ -32,7 +32,6 @@ local var_value   = kpse.var_value
 local gsub  = string.gsub
 local lower = string.lower
 local match = string.match
-local format = string.format
 
 local insert = table.insert
 

l3build-upload.lua

@@ -34,8 +34,6 @@ local popen = io.popen
 local read  = io.read
 local write = io.write
 
-local os_type = os.type
-
 local len   = string.len
 local lower = string.lower
 local match = string.match

l3build.lua

@@ -32,19 +32,15 @@ local lfs = require("lfs")
 
 -- Local access to functions
 
-local assert           = assert
 local ipairs           = ipairs
 local insert           = table.insert
 local lookup           = kpse.lookup
 local match            = string.match
 local gsub             = string.gsub
 local next             = next
 local print            = print
-local select           = select
-local tonumber         = tonumber
 local exit             = os.exit
 local open             = io.open
-local stdout           = io.stdout
 
 -- l3build setup and functions
 kpse.set_program_name("kpsewhich")