[Bug 237745] Mk/Uses/qt-dist.mk: fix qt5 with GCC architectures

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237745

--- Comment #9 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Mark Millard from comment #7)

I forgot to mention: powerpc64 context for building.
In my case a system-clang-8 based world, no gcc 4.2.1
present.

Side note for the system-clang-8 context:

Without another change devel/qt5-core builds but is
incoherent by having both libstdc++ and libc++/libcxxrt
involved overall in /usr/local/lib/qt5/bin/qlalr :

/usr/local/lib/libicui18n.so.64
/usr/local/lib/libicuuc.so.64

are not built by GCC (in my case gcc8/g+=8) and cause
libc++/libcxxrt to be in use in addition to the
libstdc++ from gcc parts of the build.

My temporary hack to work around the issue is as follows
but would not be appropriate for a gcc 4.2.1 environment.

@@ -171,7 +171,9 @@
                       
${PORTSDIR}/devel/${_QT_RELNAME}/files/extrapatch-mkspecs_features_qt__module.prf
\
                       
${PORTSDIR}/devel/${_QT_RELNAME}/files/extrapatch-mkspecs_common_bsd_bsd.conf \
                       
${PORTSDIR}/devel/${_QT_RELNAME}/files/extrapatch-mkspecs_freebsd-clang_qmake.conf
-.        if ${ARCH:Mmips*} || ${ARCH:Mpowerpc*} || ${ARCH} == sparc64
+.        if ${ARCH:Mpowerpc64}
+               # HACK: for experimenting with a system-clang-8-based world
+.        elif ${ARCH:Mmips*} || ${ARCH:Mpowerpc*} || ${ARCH} == sparc64
 _EXTRA_PATCHES_QT5+=  
${PORTSDIR}/devel/${_QT_RELNAME}/files/extra-patch-mkspecs_common_g++-base.conf
\
                       
${PORTSDIR}/devel/${_QT_RELNAME}/files/extra-patch-mkspecs_common_gcc-base.conf
\
                       
${PORTSDIR}/devel/${_QT_RELNAME}/files/extrapatch-mkspecs_freebsd-g++_qmake.conf

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