chore: import upstream snapshot with attribution

examples/c/env.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+  
+// Most of the C compilers support a third parameter to main which
+// store all envorinment variables
+int main(int argc, char *argv[], char * envp[])
+{
+    int i;
+    for (i = 0; envp[i] != NULL; i++)
+        printf("\n%s", envp[i]);
+    getchar();
+    return 0;
+}