[TharunBabu-05]

checklist for this pull request

• I've read the guidelines for contributing to this repository.
• I made sure to follow the project's coding style.
• I've documented every RZ_API function and struct this PR changes. (No RZ_API is changed — the edited function egg_get_cflags is static.)
• I've added tests that prove my changes are effective.
• I've updated the Rizin book with the relevant information (not needed).
• I've used AI tools to generate fully or partially these code changes and I'm sure the changes are not copyrighted by somebody else.

Detailed description

rz-gg always passes -include <incdir>/sflib/<os>-<arch>-<bits>/sflib.h to the
compiler (egg_get_cflags() in librz/egg/egg_c_compile.c). A sflib.h only
exists for some targets, so compiling C for a target that has none — e.g.
ios-arm-32 / ios-arm-64 — fails on the missing include file before the
compiler even starts.

This matches the behaviour reported in #5519 (there, windows-x86-32). As
discussed in that thread, the agreed fix is not to add shellforge support
for those targets, but to skip the missing header: when sflib.h does not
exist for the target, print a warning and compile without it. Code that uses no
syscalls still builds; code that needs sflib.h fails later at compile time as
before.

Change:

• egg_get_cflags() now checks rz_file_exists() on the resolved sflib.h
  path. If it exists, the -include flag is added as before; otherwise it logs
  egg: sflib.h is not available for '<triplet>', compiling without it and
  omits the flag.

No RZ_API is affected.

AI disclosure: Claude Code (Anthropic Claude) was used to analyse the issue and
draft the change and the tests. I reviewed the change, verified it compiles and
behaves as described, and confirmed the tests pass. The corresponding commit
carries the Co-authored-by agent: trailer per AGENTS.md.

Test plan

Two cases added to test/db/tools/rz_gg:

• sflib.h missing for the target — rz-gg -k ios -a arm -b 32 … must emit the
  WARNING: egg: sflib.h is not available for 'ios-arm-32', compiling without it
  line (checked via REGEXP_FILTER_ERR).
• sflib.h found for the target — rz-gg -k linux -a x86 -b 64 … must emit no
  such warning.

Verified on CI (Ubuntu, meson/ninja):

• With the change: rz-test db/tools/rz_gg → 68 OK, 0 XX; and
  rz-gg -k ios -a arm -b 32 bins/other/rz-gg/hi.c prints the warning first
  (then fails at the xcrun step, since the iOS toolchain isn't present on the
  runner — unrelated to this change).
• With the change reverted: the sflib.h missing test fails (1 XX), confirming
  the test catches the regression.

Closing issues

closes #5519

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