fprintf/printf output not displayed without newline

[jimmonte]

If a C program does not have a newline at the end of the string passed as an argument to fprintf or printf when generating Wasm from C, the output is not displayed. The first example at https://developer.mozilla.org/en-US/docs/WebAssembly/C_to_wasm with the newline of the printf removed will demonstrate this issue.

`
#include <stdio.h>

int main() {
printf("Hello World");
}

For this example, there is no output from the program displayed on the web page.
`

[kripken]

This is because the runtime is not shut down by default. In a debug build you will get a warning on this. For more details see https://emscripten.org/docs/getting_started/FAQ.html?highlight=faq#what-does-exiting-the-runtime-mean-why-don-t-atexit-s-run