mipsle: build softfloat and hardfloat (#162)

Build both `softfloat` and `hardfloat` version for `mipsle` GOARCH

Author: maddie

build.py

@@ -11,7 +11,8 @@
     ["linux", "arm64"],
     ["linux", "mips", "softfloat"],
     ["linux", "mips", "hardfloat"],
-    ["linux", "mipsle"],
+    ["linux", "mipsle", "softfloat"],
+    ["linux", "mipsle", "hardfloat"],
     ["linux", "mips64"],
     ["linux", "mips64le"],
     ["freebsd", "386"],