32 bits arch issues (new ones)

[eclipseo]

Go 1.15 rc 1 on Fedora Rawhide armv7hl and i686:

--- FAIL: TestPrimitiveIntBinary (0.00s)
    integer_test.go:24: schema: "int"; Datum: -2147483647; Actual: "1"; Expected: "-2147483647"
    integer_test.go:30: schema: "int"; Datum: 1455301406; Actual: "-692182242"; Expected: "1455301406"
    integer_test.go:31: schema: "int"; Datum: 2147483647; Actual: "-1"; Expected: "2147483647"
FAIL
exit status 1
FAIL	github.com/linkedin/goavro	0.067s