Make build hermetic without shell scripts

- Fix some minor issues in ar.com
- Have execve() look for `ape` command
- Rewrite NT paths using /c/ rather /??/c:/
- Replace broken GCC symlinks with .sym files
- Rewrite $PATH environment variables on startup
- Make $(APE_NO_MODIFY_SELF) the default bootloader
- Add all build command dependencies to build/bootstrap
- Get the repository mostly building from source on non-Linux

test/libc/fmt/fmt_test.c

@@ -278,6 +278,11 @@ TEST(fmt, p) {
                gc(xasprintf("% 10p", 0xffff800000031337)));
 }
 
+TEST(fmt, quoted) {
+  ASSERT_STREQ("   \"hello\"", gc(xasprintf("%`*.*s", 10, 5, "hello")));
+  ASSERT_STREQ("\"hello\"   ", gc(xasprintf("%-`*.*s", 10, 5, "hello")));
+}
+
 TEST(fmt, regress) {
   char buf[512];
   const char *meth = "GET";

test/libc/fmt/test.mk

@@ -49,7 +49,7 @@ o/$(MODE)/test/libc/fmt/%.com.dbg:			\
 		o/$(MODE)/test/libc/fmt/fmt.pkg		\
 		$(LIBC_TESTMAIN)			\
 		$(CRT)					\
-		$(APE)
+		$(APE_NO_MODIFY_SELF)
 	@$(APELINK)
 
 $(TEST_LIBC_FMT_OBJS): test/libc/fmt/test.mk