Fix CXXFLAGS and only set the C++ version in CXXFLAGS. #118
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CPPFLAGS are used for building both C and C++ programs, and clang
complains when -std=c++11 is used when the driver is invoked in C mode.
Using CXXFLAGS to set this allows rtorrent-ps to be successfully built
with clang.
Unfortunately, fixing CXXFLAGS requires a new hack to ensure -O2 is
uniformly used. Otherwise, autoconf will break when detecting XMLRPC-C
support with an error like the one in #76.