libz-sys simplified stdout compilation test

gistfile1.txt

test.c:
#include <stdio.h>

int main(int argc, char *argv[]) {
    char buf[128] = {0};

    printf("TESTING TESTING TESTING\n");
    snprintf(buf, 128, "%s", "TESTING TESTING TESTING\n");
    printf("%s", buf);
}

Failing options:
$ cc -O3 -fPIC -arch arm64 -miphoneos-version-min=7.0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk -fembed-bitcode -DSTDC -D_LARGEFILE64_SOURCE -D_POSIX_SOURCE -o test test.c
test.c:8:5: error: implicitly declaring library function 'snprintf' with type 'int (char *, unsigned long, const char *, ...)' [-Werror,-Wimplicit-function-declaration]
    snprintf(buf, 128, "%s", "TESTING TESTING TESTING\n");
    ^
test.c:8:5: note: include the header <stdio.h> or explicitly provide a declaration for 'snprintf'
1 error generated.

Working options:
$ cc -O3 -fPIC -arch arm64 -miphoneos-version-min=7.0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk -fembed-bitcode -DSTDC -D_LARGEFILE64_SOURCE -o test test.c