Build failed with c code

[star-hengxing]

Describe the bug

include/rime_api.h(253): error C2059: syntax error: 'string'
include/rime_api.h(254): error C2059: syntax error: 'string'
include/rime_api.h(514): error C2059: syntax error: 'string'
error C2065: 'rime_get_api': undeclared identifier

To Reproduce

#define RIME_IMPORTS
#include <rime_api.h>

int main()
{
    void* f = rime_get_api;
}

Expected behavior
Remove extern "C"

librime/src/rime_api.h

Lines 21 to 26 in 2930c26

	#define RIME_DLL __declspec(dllexport)
	#define RIME_API extern "C" RIME_DLL
	#elif defined(RIME_IMPORTS)
	/* DLL import */
	#define RIME_DLL __declspec(dllimport)
	#define RIME_API extern "C" RIME_DLL