Add --config no_sframe to work around linker errors.

Introduces a `no_sframe` config in `.bazelrc` to disable SFrame (Simple Frame) generation using `-Wa,--gsframe=no`. This helps resolve linker errors like "relocation refers to a discarded section" that can occur with GCC 15+ and LLD 19+ in non-release builds. The build documentation is updated to include this troubleshooting step.

SFrame (Simple Frame):
https://sourceware.org/binutils/wiki/sframe

#codehealth

PiperOrigin-RevId: 919460188

Author: hiroyuki-komatsu

docs/build_mozc_for_linux.md

@@ -130,6 +130,16 @@ configurations. Try the following command to
 bazelisk clean --expunge
 ```
 
+### Troubleshooting: Linker error `relocation refers to a discarded section`
+
+If you encounter linker errors related to `.sframe` sections (e.g., `relocation
+refers to a discarded section` when using GCC 15+ and LLD 19+ in non-release
+builds), you can append `--config no_sframe` to disable SFrame generation:
+
+```sh
+bazelisk build package --config no_sframe
+```
+
 ### How to customize installation locations
 
 Here is a table of contents in `mozc.zip` and their actual build target names.

src/.bazelrc

@@ -82,3 +82,6 @@ build:win_universal_installer --//:win_universal_installer
 build:android_env --copt "-DOS_ANDROID"
 build:android_env --build_tag_filters=-noandroid
 test:android_env  --test_tag_filters=-noandroid
+
+## SFrame relocation errors workaround for GCC 15+ and LLD 19+
+build:no_sframe --copt="-Wa,--gsframe=no" --host_copt="-Wa,--gsframe=no"