[Bug 202901] games/qqwing configure narrowly searches for gcc or cc and Makefile hard-codes CC CXX CPP plus does not respect CFLAGS

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202901

            Bug ID: 202901
           Summary: games/qqwing configure narrowly searches for gcc or cc
                    and Makefile hard-codes CC CXX CPP plus does not
                    respect CFLAGS
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gnome at FreeBSD.org
          Reporter: kennethsalerno at yahoo.com
          Assignee: gnome at FreeBSD.org
             Flags: maintainer-feedback?(gnome at FreeBSD.org)

QQWing uses a configure script that narrowly searches for literally "gcc" or
cc, but will never find "gcc5" or "gcc48" and "g++5" or "g++48" if that is what
the user has set his CC CXX and CPP flags to use for ports. On top of that, the
port's Makefile hard-codes CC, CXX and CPP to use clang (or gcc 4.2 on FreeBSD
version < 10).

The configure script should be patched to just use "cc" and "c++" if CC CXX and
CPP are not set by the user, which would obsolete the need to hard-code CC CXX
CPP flags in the port's Makefile while making it flexible to support gcc5/gcc48
without modification.

test -z "$CC" && CC=cc
test -z "$CXX" && CXX=c++

Another patch would be required of the automake files to respect CFLAGS
(hard-coded to -O2 -g), CXXFLAGS and LDFLAGS but first thing's first, need to
respect compiler chosen.

The reason I happened upon this issue is because my ports are compiled with
gcc5/g++5 and when qqwing got compiled with clang I ran into an ABI
incompatibility when linking gnome-sudoku (built with gcc5) forcing me to hack
the qqwing configure script to find g++5.

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