[Build] 16-bit: Unconditionally rebuild everything by default

Yup, let's completely avoid any of the benefits a Makefile might have
had, because they're completely unreliable without spelling out every
single #include. Such a trash technology, unsuited for pretty much
anything it's touted for.

Oh well, you can still call `maker` manually without the -B flag, if
you know for a fact that you've only modified the dependencies
currently listed. 🤷
At least this flag exists, and we don't have to add something like a
dummy .OBJ to each and every list of dependencies, so that we then can
force rebuilds by simply `touch`ing that one file…

Part of P0001, funded by GhostPhanom.

build16b.bat

@@ -12,7 +12,7 @@ tcc >NUL
 if errorlevel 9009 goto no_tcc
 if errorlevel 216 goto 64_bit
 
-maker
+maker -B
 if errorlevel 9009 goto no_make
 if errorlevel 216 goto 64_bit
 goto eof

build32b.bat

@@ -25,8 +25,6 @@ set CXX32FLAGS=%CXX32FLAGS% -O2 -v- -x-
 mkdir bin\Pipeline 2>NUL
 for /L %%i in (1,1,5) do mkdir bin\th0%%i 2>NUL
 
-del /S *.obj
-
 set BMP2ARR=bin\Pipeline\bmp2arr.exe
 
 %CXX32% %CXX32FLAGS% -nbin/Pipeline/ Pipeline\bmp2arr.c Pipeline\bmp2arrl.c