Tests error on 32 bits arches

[eclipseo]

Golang 1.12.6 on i686 and armv7

Testing    in: /builddir/build/BUILD/treeprint-a009c3971eca89777614839eb7f69abed3ea3959/_build/src
         PATH: /builddir/build/BUILD/treeprint-a009c3971eca89777614839eb7f69abed3ea3959/_build/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/sbin
       GOPATH: /builddir/build/BUILD/treeprint-a009c3971eca89777614839eb7f69abed3ea3959/_build:/usr/share/gocode
  GO111MODULE: off
      command: go test -buildmode pie -compiler gc -ldflags "-X github.com/xlab/treeprint/version.commit=a009c3971eca89777614839eb7f69abed3ea3959 -X github.com/xlab/treeprint/version=0 -extldflags '-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld '"
      testing: github.com/xlab/treeprint
github.com/xlab/treeprint
--- FAIL: TestFromStructTypeSize (0.00s)
    struct_test.go:115: 
        	Error Trace:	struct_test.go:115
        	Error:      	Not equal: 
        	            	expected: ".\n├── [16]  one\n├── [8]  two\n└── [72]  Three\n    ├── [24]  SubOne\n    ├── [24]  SubTwo\n    └── [24]  SubThree\n        └── [8]  inner_three\n"
        	            	actual  : ".\n├── [8]  one\n├── [4]  two\n└── [36]  Three\n    ├── [12]  SubOne\n    ├── [12]  SubTwo\n    └── [12]  SubThree\n        └── [8]  inner_three\n"
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1,8 +1,8 @@
        	            	 .
        	            	-├── [16]  one
        	            	-├── [8]  two
        	            	-└── [72]  Three
        	            	-    ├── [24]  SubOne
        	            	-    ├── [24]  SubTwo
        	            	-    └── [24]  SubThree
        	            	+├── [8]  one
        	            	+├── [4]  two
        	            	+└── [36]  Three
        	            	+    ├── [12]  SubOne
        	            	+    ├── [12]  SubTwo
        	            	+    └── [12]  SubThree
        	            	         └── [8]  inner_three
        	Test:       	TestFromStructTypeSize
FAIL
exit status 1
FAIL	github.com/xlab/treeprint	0.009s

[xlab]

le fu :)

I'll try to use something platform-independent here..