dev-util/codeblocks: version bump to 17.12

dev-util/codeblocks: version bump to 17.12

Code::Blocks IDE package version bump to 17.12 with
switching 'WX_GTK_VER' from x11-libs/wxGTK:2.8 to x11-libs/wxGTK:3.0

This also adds a new USE flag 'fortran' which controls the
building of 'FortranProject plugin' for Code::Blocks IDE
( https://sourceforge.net/projects/fortranproject/ )
after applying of 'FortranProject_autotools_build.diff' patch.

Add patch 'FortranProject_fix_build_gcc7_failed.patch'
from upstream that fix gcc7 compilation error
"call of overloaded ‘abs(unsigned int)’ is ambiguous"
for FortranProject plugin, i.e. when USE="fortran".

Remove USE=flag "static" with passing "--disable-static"
to econf within src_configure() section.

Remove directly passing "-g" compiler option to CFLAGS
and CXXFLAGS when USE="debug" by applying the patch
'codeblocks-17.12-nodebug.diff'.

Updating 'metadata.xml' file:
Adding 'fortran' USE-flag description for 'dev-util/codeblocks-17.12'.

Updating 'Manifest' file:
Adding size, blake2 and sha512 checksums for 'codeblocks_17.12.tar.xz' tarball

Bug: https://bugs.gentoo.org/643494
Closes: https://bugs.gentoo.org/643494