nvim: lower packer's max_jobs to 5 in termux

.config/nvim/lua/blake/plugins.lua

@@ -8,6 +8,13 @@ if fn.empty(fn.glob(install_path)) > 0 then
 end
 -- }}
 
+-- Reduce the maximum number of jobs in termux (a terminal for android)
+if os.getenv("TERMUX_VERSION") ~= nil then
+   Packer_max_jobs = 5
+else
+   Packer_max_jobs = 100
+end
+
 local use = require('packer').use
 
 return require('packer').startup({function()
@@ -580,7 +587,7 @@ config = {
    -- Don't ask before removing plugins
    autoremove = true,
    -- Limit max jobs to avoid getting killed on low-end hardware
-   max_jobs = 50,
+   max_jobs = Packer_max_jobs,
 }})
 
 -- how to align all plugin descriptions: select all plugins in visual line, :'<,'>Align \(.\+use { -- .\+: \+\)\@<=[^ ][^:]\+$