[oe] [meta-qt5] qtwebengine/chromium/v8 requires lib32 version of host C++ headers (libc++-dev:i386)

[Denys Dmytriyenko]

I've got this error below on one of my build machines, and on close 
inspection, it looks like qtwebengine/chromium/v8 requires host side C++ 
headers in 32-bit besides normal 64-bit version, i.e. libc++-dev:i386 or 
lib32stdc++-dev.

How can we check for this and/or document this requirement?

Logs (notice hosttools/g++ and -m32):

FAILED: v8_snapshot/obj/v8/mkpeephole/bytecodes.o 
.../tmp-glibc/hosttools/g++ -MMD -MF v8_snapshot/obj/v8/mkpeephole/bytecodes.o.d -DV8_DEPRECATION_WARNINGS -DUSE_UDEV -DUSE_AURA=1 -DUSE_NSS_CERTS=1 -DUSE_OZONE=1 -DNO_TCMALLOC -DDISABLE_NACL -DENABLE_TASK_MANAGER=1 -DENABLE_THEMES=1 -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DCHROMIUM_BUILD -DFIELDTRIAL_TESTING_ENABLED -DTOOLKIT_QT -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DV8_I18N_SUPPORT -DV8_TARGET_ARCH_ARM -DCAN_USE_ARMV7_INSTRUCTIONS -DCAN_USE_VFP3_INSTRUCTIONS -DCAN_USE_VFP32DREGS -DCAN_USE_NEON -DUSE_EABI_HARDFLOAT=1 -Iv8_snapshot/gen -I../../../../git/src/3rdparty/chromium -I../../../../git/src/3rdparty/chromium/v8/include -Iv8_snapshot/gen/v8/include -I../../../../git/src/3rdparty/chromium/v8 -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -funwind-tables -fPIC -pipe -pthread -m32 -msse2 -mfpmath=sse -mmmx -g0 -fvisibility=hidden -Wno-unused-local-typedefs -Wno-maybe-uninitialized -Wno-missing-field-initializers -Wno-unused-parameter -O3 -fno-ident -fdata-sections -ffunction-sections -fno-threadsafe-statics -fvisibility-inlines-hidden -std=gnu++11 -fno-delete-null-pointer-checks -fno-rtti -fno-exceptions -Wno-deprecated -Wno-narrowing -c ../../../../git/src/3rdparty/chromium/v8/src/interpreter/bytecodes.cc -o v8_snapshot/obj/v8/mkpeephole/bytecodes.o
In file included from ../../../../git/src/3rdparty/chromium/v8/src/interpreter/bytecodes.h:8:0,
                 from ../../../../git/src/3rdparty/chromium/v8/src/interpreter/bytecodes.cc:5:
/usr/include/c++/5/cstdint:38:28: fatal error: bits/c++config.h: No such file or directory
compilation terminated.