Fix breakage of 32-bit ARM build.

[saurik]

While some platforms support @progbits with a @, as far as I can tell all support it with %. Notably, 32-bit ARM (armeabi-v7a for Android, in my case) seems to not support the @.

<inline asm>:1:41: error: expected '%<type>' or "<type>"
    1 | .pushsection ".debug_gdb_scripts", "MS",@progbits,1
      |                                         ^
<inline asm>:101:12: error: .popsection without corresponding .pushsection
  101 | .popsection
      |            ^
2 errors generated.

This is (I presume) the actual underlying cause of the Android issue that was fixed in ebcd267, but it doesn't only affect Android: I'm also getting this when trying to compile for 32-bit ARM desktop Linux systems. I've thereby also removed the new !ANDROID ifdef as part of this fix.

[ned14]

Thanks for this. Didn't realise that @ = % would fix this.