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Update ch2-02-basic.md

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在windows下， 有static的话 会报错。其它平台不知道。

```
# command-line-arguments
C:\Users\ADMINI~1\AppData\Local\Temp\go-build177025346\b001\_cgo_main.o:_cgo_main.c:(.data+0x0): undefined reference to `os'
collect2.exe: error: ld returned 1 exit status
```
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smallwhite 2019-01-18 18:33:31 +08:00 committed by GitHub
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@ -121,7 +121,7 @@ package main
#cgo linux CFLAGS: -DCGO_OS_LINUX=1 #cgo linux CFLAGS: -DCGO_OS_LINUX=1
#if defined(CGO_OS_WINDOWS) #if defined(CGO_OS_WINDOWS)
static const char* os = "windows"; const char* os = "windows";
#elif defined(CGO_OS_DARWIN) #elif defined(CGO_OS_DARWIN)
static const char* os = "darwin"; static const char* os = "darwin";
#elif defined(CGO_OS_LINUX) #elif defined(CGO_OS_LINUX)