[binutils-gdb] gdb: fix build failure on armhf

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=90d06836df5a36aa61768bd39cde0a568c69fac7

commit 90d06836df5a36aa61768bd39cde0a568c69fac7
Author: Matthieu Longo <[email protected]>
Date:   Thu Mar 12 10:18:59 2026 +0000

    gdb: fix build failure on armhf
    
    armhf build fails because the implicit conversion operator from
    rgb_color to `uint8_t *' introduces an ambiguity.
    
    In ./gdb/tui/tui-io.c, expressions such as:
    
      init_color (next, rgb[0] * 1000 / 255, rgb[1] * 1000 / 255, ...
    
    become ambiguous between:
    
      constexpr uint8_t& rgb_color::operator[](std::size_t)’
      operator[](uint8_t* {aka unsigned char*}, int) (built-in)
    
    leading to a build error:
    
      error: ISO C++ says that these are ambiguous
    
    Fix the issue by removing the unused implicit conversion operator.
    
    Approved-By: Simon Marchi <[email protected]>
    Approved-By: Tom Tromey <[email protected]>

Diff:
---
 gdb/ui-style.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/gdb/ui-style.h b/gdb/ui-style.h
index a1d656cd39c..fc40b93709d 100644
--- a/gdb/ui-style.h
+++ b/gdb/ui-style.h
@@ -72,7 +72,6 @@ public:
   constexpr uint8_t g () const noexcept { return m_data[1]; }
   constexpr uint8_t b () const noexcept { return m_data[2]; }
 
-  constexpr operator uint8_t *() noexcept { return m_data.data (); }
   constexpr size_t size () const noexcept { return m_data.size (); }
 
   constexpr uint8_t &operator[] (std::size_t idx) noexcept