qt5-qtwebengine not building for armv7

https://build.alpinelinux.org/buildlogs/build-edge-armv7/community/qt5-qtwebengine/qt5-qtwebengine-5.15.0-r0.log

../../3rdparty/chromium/v8/src/base/cpu.cc: In function 'uint32_t v8::base::ReadELFHWCaps()':
../../3rdparty/chromium/v8/src/base/cpu.cc:122:22: error: 'Elf32_auxv_t' does not name a type
  122 |   using elf_auxv_t = Elf32_auxv_t;
      |                      ^~~~~~~~~~~~
../../3rdparty/chromium/v8/src/base/cpu.cc:124:8: error: 'elf_auxv_t' was not declared in this scope
  124 |   for (elf_auxv_t* entry = reinterpret_cast<elf_auxv_t*>(head);
      |        ^~~~~~~~~~
../../3rdparty/chromium/v8/src/base/cpu.cc:124:20: error: 'entry' was not declared in this scope; did you mean 'encrypt'?
  124 |   for (elf_auxv_t* entry = reinterpret_cast<elf_auxv_t*>(head);
      |                    ^~~~~
      |                    encrypt
../../3rdparty/chromium/v8/src/base/cpu.cc:124:45: error: 'elf_auxv_t' does not name a type
  124 |   for (elf_auxv_t* entry = reinterpret_cast<elf_auxv_t*>(head);
      |                                             ^~~~~~~~~~
../../3rdparty/chromium/v8/src/base/cpu.cc:124:55: error: expected '>' before '*' token
  124 |   for (elf_auxv_t* entry = reinterpret_cast<elf_auxv_t*>(head);
      |                                                       ^
../../3rdparty/chromium/v8/src/base/cpu.cc:124:55: error: expected '(' before '*' token
  124 |   for (elf_auxv_t* entry = reinterpret_cast<elf_auxv_t*>(head);
      |                                                       ^
      |                                                       (
../../3rdparty/chromium/v8/src/base/cpu.cc:124:56: error: expected primary-expression before '>' token
  124 |   for (elf_auxv_t* entry = reinterpret_cast<elf_auxv_t*>(head);
      |                                                        ^
../../3rdparty/chromium/v8/src/base/cpu.cc:124:63: error: expected ')' before ';' token
  124 |   for (elf_auxv_t* entry = reinterpret_cast<elf_auxv_t*>(head);
      |                                                               ^
      |                                                               )

I did not look into the details yet, but I guess we need to change the ifdef here:

#ifdef __LP64__
  using elf_auxv_t = Elf64_auxv_t;
#else
  using elf_auxv_t = Elf32_auxv_t;
#endif

CC: @PureTryOut (maintainer)