Revert "[snapshot] Add '.note.GNU-stack' marker section for ELF snapshots"

This reverts commit f24e9958.

Reason for revert: Speculative revert for https://bugs.chromium.org/p/chromium/issues/detail?id=981138

Original change's description:
> [snapshot] Add '.note.GNU-stack' marker section for ELF snapshots
>
> This snapshot adds a marker section to the output assembly of
> mksnapshot. Omitting this section can imply an executable stack, which
> can result in linker warnings.
>
> R=​jgruber@chromium.org
>
> Change-Id: I6f5dacb24de3a852faf6ce0caf18c32b499ba5a9
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1687669
> Commit-Queue: Simon Zünd <szuend@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#62504}

TBR=jgruber@chromium.org,szuend@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:981138
Change-Id: Iad05bb8e4222d62db8266ae250d79a37259f3008
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1687416Reviewed-by: Simon Zünd <szuend@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62534}

src/snapshot/embedded/platform-embedded-file-writer-generic.cc

@@ -127,15 +127,7 @@ void PlatformEmbeddedFileWriterGeneric::DeclareExternalFilename(
   fprintf(fp_, ".file %d \"%s\"\n", fileid, fixed_filename.c_str());
 }
 
-void PlatformEmbeddedFileWriterGeneric::FileEpilogue() {
-  // Omitting this section can imply an executable stack, which is usually
-  // a linker warning/error. C++ compilers add these automatically, but
-  // compiling assembly requires the .note.GNU-stack section to be inserted
-  // manually.
-  // Additional documentation:
-  // https://wiki.gentoo.org/wiki/Hardened/GNU_stack_quickstart
-  fprintf(fp_, ".section .note.GNU-stack,\"\",%%progbits\n");
-}
+void PlatformEmbeddedFileWriterGeneric::FileEpilogue() {}
 
 int PlatformEmbeddedFileWriterGeneric::IndentedDataDirective(
     DataDirective directive) {