compile time errors when including header file emscripten.h from $ENV{EMSDK}/upstream/emscripten/cache/sysroot/include/emscripten

emcc - v3.1.71

including header file emscripten.h compiles successfully but it causes compile time error
which hinders code completion such as ```emscripten_set_main_loop```.

cmake config
```
target_include_directories(
${CMAKE_PROJECT_NAME}
PUBLIC
$ENV{EMSDK}/upstream/emscripten/cache/sysroot/include/emscripten
)
```
for some unknown reason cmake can't include this specific path
```
$ENV{EMSDK}/upstream/emscripten/cache/sysroot/include
```
so i use
```
$ENV{EMSDK}/upstream/emscripten/cache/sysroot/include/emscripten
```
instead.

#### first error
```In included file: 'emscripten/em_macros.h' file not found```.
solution
```
// em_js.h
#include em_macros.h
```

#### second new error
```In included file: typedef redefinition with different types ('struct _iobuf' vs 'struct _IO_FILE') [redefinition_different_typedef]```.

```
// emscripten.h
struct _IO_FILE;
typedef struct _IO_FILE FILE;

char *emscripten_get_preloaded_image_data(const char *path, int *w, int *h);
char *emscripten_get_preloaded_image_data_from_FILE(FILE *file, int *w, int *h);
```
my naive solution
```
// emscripten.h
struct _IO_FILE;

char *emscripten_get_preloaded_image_data(const char *path, int *w, int *h);
char *emscripten_get_preloaded_image_data_from_FILE(_IO_FILE *file, int *w, int *h);

```

after the following changes compile time error gone and code completion now works.