Clang analyze target in GTK+ makefiles and dropping g++ 4.2

[Neil Hodgson]

It has been possible to run "clang --analyze" for Scintilla and SciTE on GTK+ by defining 'CLANG_ANALYZE=1' when running make. This works by running 'clang --analyze' as if it is a compiler but it doesn't produce any object files so fails later in the build.

There is now an 'analyze' target with no such side effects and CLANG_ANALYZE is gone. Thus to check, run
make analyze

There are several warnings on Fedora 18 with both g++ and clang from system headers for Pango having an enumeration with a trailing ',' which is not legal in C++03 but is in C++11. These can be avoided with either -std=c++11 or -std=c++0x. These were available in g++ 4.7 (March 2012) and g++ 4.3 (March 2008) respectively, so would break builds with old distributions. At some point one of these (probably c++0x) should be used as there have been other issues - long long, for example. This will mean g++ 4.2 and earlier will not work so users of old distributions and OS X will not be able to build without some effort.

Neil