What changed in EDuke32, build by build

Add USE_SSE2 option for 32-bit x86 and default it to off

Add DBGLEVEL so I can set it to 3 and get macros in my symbols

Separate -Wl,--dynamicbase into its own variable so it can be disabled independently.

Disable manifest file generation on all platforms

Allow component cflags to override global CWARNS for clang-tools rule.

Build debug builds with -Og instead of -O0 where available.

Fix building the tools on Mac.

More no-shell stuff that I didn't want to rebase past the lowercase stuff.

Make the dynamic rule creation a little bit simpler, thanks to the previous commit.

Make most variables in the component construction lowercase.

Mess with Wii stuff to fix a majority of its make invocation circumstances.

Move rules around to unbreak Linux builds. This may be a GNU Make bug. DONT_BUILD.

Distinguish between .c files in rsrc and ones generated at build time in obj.

Add libxmp-lite, replacing static linking to a library that was uncommon in Linux and Mac package managers.

Add LPeg sources, replacing the haphazard static linking that required a custom-built library in a hardcoded location.

Move the ENet group up into a new section for libraries that are not ours but included in our repository.

Remove manual assembly of object file lists and replace it with a system for tracking dependencies between groups.

Rename some groups so that the part before the first _ corresponds to the parent group that has _SRC and _OBJ defines.

Replace "gnu" with "c" in language standard declarations if we are using clang.

Add phony target "clang-tools" for use with clang-tools.

Add *_ORDERONLYDEPS, which saves us an error message when building Lunatic on Mac.

Add *_SRCS variables, which reassemble the full paths of all source files.

Separate combinations of component objects for the six build targets into a variable specifically representing the combination.

Use -std=c99 and -std=c++03 instead of -std=gnu99 and -std=gnu++03.

Use "clang++" for building C++ with clang.

Add CROSS_SUFFIX option, as requested by rhoenie.

Move CUSTOMOPT to follow COMPILERFLAGS and LINKERFLAGS, so that it can overwrite more.

Move "-Wimplicit -Werror-implicit-function-declaration" from CONLYFLAGS to a new CONLYWARNS.

Delete the default suffixes, to possible help avoid internal Make race conditions.

Only pass APPNAME and APPBASENAME to the preprocessor if a value for them was passed in.

Use the override keyword when implicitly disabling Polymer and libvpx when USE_OPENGL=0.

Fix STARTUP_WINDOW=0 on Windows so that the resource objects are built, but the editor's startup window is not. DONT_BUILD.

Extend STARTUP_WINDOW to GTK. DONT_BUILD.

Fold OSX_STARTUPWINDOW into STARTUP_WINDOW. DONT_BUILD.

Remove -fno-pic from everywhere. This should fix building on Ubuntu 16.10 and any other platform that has PIE enabled.

Revert r5864 and move some code introduced in r5762 to a later Mac-only block so that architecture detection is not broken on Linux.

Allow an invocation like `make CC=clang-3.8` to work properly.

Only apply $(ARCH) processing code on Macs.

Switch the detection order of OPTOPT flags so that i386 is checked after x86_64. This ensures full compatibility for fat OS X binaries built using ARCH="-arch i386 -arch x86_64".

Create GTK *_banner.c files in obj/ subfolders instead of rsrc/ so that they don't need separate cleanup rules.

Make Objective-C code build as Objective-C++ when we build C code as C++.

Add extra optimization defaults for OS X builds since all Intel Macs are guaranteed certain features due to the time of their debut.

Clean up handling of architectures.

Convert object lists to an escaped multi-line format for better diffing.

Add some missing dependencies on the folders in which objects are created.

Add L_CXXONLYFLAGS, and use it to pass "-static-libstdc++" on Windows.

Remove STATICSTDCPP variable.

Rename "CPPONLYFLAGS" variable to "CXXONLYFLAGS", since "CPPFLAGS" traditionaly refers to the C preprocessor, not C++.

Automatically disable ASM when "arm" is found in `uname -m` on Linux.

Link to libz on OS X like on Windows.

Update/fix treatment of libpng libraries and headers under Windows and OS X.