x11-toolkits/fox17: Update to 1.7.85

Remove the graphics/libpng dependency and configure option. PNG support
is now entirely built-in.

graphics/libGLU is only needed to build the glviewer test program. Its
presence on the host system doesn't affect the installation.

Remove reference to removed port x11-toolkits/fox14.

Pet portclippy(1) and portlint (1).

Update patches due to changes in base and to make them more upstream-
friendly.

Changes:

• New PNG image support. First, its faster! Also, it no longer requires libpng; the PNG format support is now built-in, although the libz compression library is still required [for now...].
• fxsavePNG() supports some fine-control via new save-flags. You can analyze the image, and shrink output by taking advantage of image features; for example, saving opaque image means alpha-channel may be dropped. If the image is gray-levels only, the RGB may be dropped to plain gray only. Also, shrinking further by emitting colormapped [indexed-color] image is possible if only a few colors are used. Finally, pre-compression filtering, as well as desired compression level can be selected.
• PNG I/O is optimized with when target ISA x86-64-v2 or higher are selected.
• FXStat::isSame() checks if two files are the same (same inode).
• FOX Desktop Calculator augmented with Unicode button labels (please select a font that has the math symbols!), also now supports additional functions, common physics constants, and other features.
• The fxCPUFeatures now can detect AVX512 presence.
• New FXPerformanceCounter and associated macros may be used to count clockcyles of critical code segments.
• FXAtomic.h APIs now mostly inlined for lower overhead.
• Read processor ticks on AARCH64.
• Adie text editor undo buffer size and undo buffer items can now be configured.
• New QOIF (Quite OK Image Format) now supported for either images (FXQOIFImage) or icons (FXQOIFIcon).
• FXColor to/from FXVec3d, FXVec3f, FXVec4d, FXVec4f now using SSE if compiled for x86-64-v2 or higher.
• Updated byte swap APIs in fxendian.h.
• New APIs in FXMat3f, FXMat3d, etc. classes to set up mirror-matrix.
• Moved new hash32() etc. functions into fxendian.h.
• Bug fix in FXIODevice reading > 1GB files in one readBlock(), writeBlock() call.
• Markdown syntax coloring in Adie.
• Per-syntax mode setting for removing trailing spaces in Adie saving a text file.
• Subtle change in operation of FXPath::relative().
• Support for CRC32 calculations added.
• Additional conversion options in FXString::fromFloat() and FXString::fromDouble(): thousands groupings, force decimal point, and hexadecimal float output.
• FXJSON JSON loader now may report duplicate key warning reading json file.
• FXMappedFile improvements.
• FXString unicode escapes bug fix.