Add support for runtime selection of float ABI

tccelf.c

@@ -1592,7 +1592,7 @@ static int elf_output_file(TCCState *s1, const char *filename)
 		/* allow override the dynamic loader */
 		const char *elfint = getenv("LD_SO");
 		if (elfint == NULL)
-		    elfint = CONFIG_TCC_ELFINTERP;
+		    elfint = DEFAULT_ELFINTERP(s1);
                 /* add interpreter section only if executable */
                 interp = new_section(s1, ".interp", SHT_PROGBITS, SHF_ALLOC);
                 interp->sh_addralign = 1;