meson: Post-process Android binaries using termux-elf-cleaner

Our legacy build system used to do this in a driver wrapper script.

meson.build

@@ -455,10 +455,13 @@ if host_os_family == 'linux' and cc.has_function('openpty', prefix: '#include <p
 endif
 
 if host_os == 'android'
+  termux_elf_cleaner = find_program('termux-elf-cleaner', native: true)
   libselinux_dep = dependency('libselinux', version: '>=3.0')
   libsepol_dep = dependency('libsepol', version: '>=3.0')
   backend_deps_private += [libselinux_dep, libsepol_dep]
   backend_reqs_private += ['libselinux', 'libsepol']
+else
+  termux_elf_cleaner = []
 endif
 
 tls_provider_dep = dependency('gioopenssl', required: get_option('connectivity'))
@@ -598,10 +601,12 @@ post_process = [
   python,
   files('tools' / 'post-process.py'),
   host_os,
+  host_abi,
   '>>>', strip, '<<<',
   get_option('strip').to_string(),
   '>>>', install_name_tool, '<<<',
   '>>>', codesign, '<<<',
+  '>>>', termux_elf_cleaner, '<<<',
   '@OUTPUT@',
   '@INPUT0@',
 ]

subprojects/termux-elf-cleaner.wrap

@@ -0,0 +1,7 @@
+[wrap-git]
+url = https://github.com/frida/termux-elf-cleaner.git
+revision = 8e572cb066907cfc8ac1f73d511683844de906ee
+depth = 1
+
+[provide]
+program_names = termux-elf-cleaner

tools/post-process.py

@@ -10,10 +10,12 @@
 def main(argv):
     args = argv[1:]
     host_os = args.pop(0)
+    host_abi = args.pop(0)
     strip_command = pop_cmd_array_arg(args)
     strip_enabled = args.pop(0) == "true"
     install_name_tool = pop_cmd_array_arg(args)
     codesign = pop_cmd_array_arg(args)
+    termux_elf_cleaner = pop_cmd_array_arg(args)
     output_path = Path(args.pop(0))
     input_path = Path(args.pop(0))
     kind = args.pop(0)
@@ -61,6 +63,11 @@ def main(argv):
                 if input_entitlements_path is not None and host_os in {"ios", "tvos"}:
                     codesign_args += ["--entitlements", input_entitlements_path]
             subprocess.run(codesign + codesign_args + [intermediate_path], **run_kwargs)
+
+        if host_os == "android":
+            api_level = 19 if host_abi in {"x86", "arm"} else 21
+            subprocess.run(termux_elf_cleaner + ["--api-level", str(api_level), "--quiet", intermediate_path],
+                           **run_kwargs)
     except subprocess.CalledProcessError as e:
         print(e, file=sys.stderr)
         print("Output:\n\t| " + "\n\t| ".join(e.output.strip().split("\n")), file=sys.stderr)