Disable PA_MUSTTAIL to fix build faiure on ppc64le

HACK-debian-clang-disable-base-musttail.patch

@@ -6,7 +6,19 @@ diff -up chromium-131.0.6778.69/base/compiler_specific.h.me chromium-131.0.6778.
  //   }
  // ```
 -#if __has_cpp_attribute(clang::musttail)
-+#if defined(__clang__) && __has_cpp_attribute(clang::musttail) && !defined(__powerpc64__)
++#if __has_cpp_attribute(clang::musttail) && !defined(__powerpc64__)
  #define MUSTTAIL [[clang::musttail]]
  #else
  #define MUSTTAIL
+diff -up chromium-131.0.6778.85/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_base/compiler_specific.h.me chromium-131.0.6778.85/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_base/compiler_specific.h
+--- chromium-131.0.6778.85/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_base/compiler_specific.h.me	2024-11-20 18:50:28.690761262 +0100
++++ chromium-131.0.6778.85/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_base/compiler_specific.h	2024-11-20 18:54:49.374711202 +0100
+@@ -138,7 +138,7 @@
+ //     PA_MUSTTAIL return Func1(d + 1);  // `Func1()` will be tail-called.
+ //   }
+ // ```
+-#if PA_HAS_CPP_ATTRIBUTE(clang::musttail)
++#if PA_HAS_CPP_ATTRIBUTE(clang::musttail) && !defined(__powerpc64__)
+ #define PA_MUSTTAIL [[clang::musttail]]
+ #else
+ #define PA_MUSTTAIL

chromium.spec

@@ -146,6 +146,9 @@
 
 # enable|disable use_custom_libcxx
 %global use_custom_libcxx 0
+%if 0%{?rhel} || 0%{?fedora} == 39
+%global use_custom_libcxx 1
+%endif
 
 # enable|disable control flow integrity support
 %global cfi 0