mail/thunderbird: fix build on powerpc64le

Already fixed in upstream xsimd:
In file included from /wrkdirs/usr/ports/mail/thunderbird/work/.build/gfx/thebes/Unified_cpp_gfx_thebes0.cpp:65:
In file included from /wrkdirs/usr/ports/mail/thunderbird/work/thunderbird-152.0/gfx/thebes/gfxAlphaRecovery.cpp:12:
In file included from /wrkdirs/usr/ports/mail/thunderbird/work/thunderbird-152.0/third_party/xsimd/include/xsimd/xsimd.hpp:63:
In file included from /wrkdirs/usr/ports/mail/thunderbird/work/thunderbird-152.0/third_party/xsimd/include/xsimd/memory/xsimd_aligned_allocator.hpp:27:
In file included from /wrkdirs/usr/ports/mail/thunderbird/work/thunderbird-152.0/third_party/xsimd/include/xsimd/config/xsimd_arch.hpp:19:
In file included from /wrkdirs/usr/ports/mail/thunderbird/work/thunderbird-152.0/third_party/xsimd/include/xsimd/types/xsimd_all_registers.hpp:51:
/wrkdirs/usr/ports/mail/thunderbird/work/thunderbird-152.0/third_party/xsimd/include/xsimd/types/xsimd_vsx_register.hpp:67:61: error: cannot use 'long' with '__vector bool'

67 |         XSIMD_DECLARE_SIMD_BOOL_VSX_REGISTER(unsigned long, long);
   |                                                             ^

/wrkdirs/usr/ports/mail/thunderbird/work/thunderbird-152.0/third_party/xsimd/include/xsimd/types/xsimd_vsx_register.hpp:67:55: warning: use of 'long' with '__vector' is deprecated [-Wdeprecated]

67 |         XSIMD_DECLARE_SIMD_BOOL_VSX_REGISTER(unsigned long, long);
   |                                                       ^

/wrkdirs/usr/ports/mail/thunderbird/work/thunderbird-152.0/third_party/xsimd/include/xsimd/types/xsimd_vsx_register.hpp:68:52: error: cannot use 'long' with '__vector bool'

68 |         XSIMD_DECLARE_SIMD_BOOL_VSX_REGISTER(long, long);
   |                                                    ^

/wrkdirs/usr/ports/mail/thunderbird/work/thunderbird-152.0/third_party/xsimd/include/xsimd/types/xsimd_vsx_register.hpp:68:46: warning: use of 'long' with '__vector' is deprecated [-Wdeprecated]

68 |         XSIMD_DECLARE_SIMD_BOOL_VSX_REGISTER(long, long);
   |                                              ^

/wrkdirs/usr/ports/mail/thunderbird/work/thunderbird-152.0/third_party/xsimd/include/xsimd/types/xsimd_vsx_register.hpp:70:54: error: cannot use 'long' with '__vector bool'

70 |         XSIMD_DECLARE_SIMD_BOOL_VSX_REGISTER(double, long);
   |                                                      ^

5 warnings and 3 errors generated.