Add back mklittlefs for linux32 target (#7011)

Fixes #7006

mklittlefs for 32-bit Linux disappeared from the packages.json.  Looks
like a transient build problem on the older eqt release (later builds
look fine).  Add it back, pointing to the first successful mklittlefs
build for lin32.

Co-authored-by: Develo <[email protected]>

package/package_esp8266com_index.template.json

@@ -319,6 +319,13 @@
                      "checksum": "SHA-256:926cca1c1f8f732a8ac79809ce0a52cabe283ab4137aa3237bca0fcca6bc2236",
                      "size": "36871"
                   },
+                  {
+                     "host": "i686-pc-linux-gnu",
+                     "url": "https://github.com/earlephilhower/esp-quick-toolchain/releases/download/2.5.0-4/i686-linux-gnu.mklittlefs-7f77f2b.1563313032.tar.gz",
+                     "archiveFileName": "i686-linux-gnu.mklittlefs-7f77f2b.1563313032.tar.gz",
+                     "checksum": "SHA-256:022c96df4d110f957d43f6d23e9c5e8b699a66d8ab041056dd5da7411a8ade42",
+                     "size": "47544"
+                  },
                   {
                      "host": "i686-mingw32",
                      "url": "https://github.com/earlephilhower/esp-quick-toolchain/releases/download/2.5.0-4/i686-w64-mingw32-mklittlefs-69bd9e6.zip",
@@ -352,4 +359,4 @@
          ]
       }
    ]
-}
+}