Make improvements

- This commit mints a new release of APE Loader v1.2 which supports
  loading ELF programs with a non-contiguous virtual address layout
  even though we've never been able to take advantage of it, due to
  how `objcopy -SO binary` fills any holes left by PT_LOAD. This'll
  change soon, since we'll have a new way of creating APE binaries.

- The undiamonding trick with our ioctl() implementation is removed
  since POSIX has been killing ioctl() for years and they've done a
  much better job. One problem it resolves, is that ioctl(FIONREAD)
  wasn't working earlier and that caused issues when building Emacs

ape/loader.lds

@@ -19,7 +19,8 @@
 ENTRY(_start)
 
 SECTIONS {
-  . = 0x200000;
+  . = 0x7fff0000;
+  __executable_start = .;
   .rodata : {
     KEEP(*(.head))
     *(.rodata .rodata.*)
@@ -29,6 +30,7 @@ SECTIONS {
     text = .;
     *(.text)
   }
+  _end = .;
   /DISCARD/ : {
     *(.*)
   }