* use dynamic memory buffers instead temporary files

* use dynamic memory buffers instead temporary files
* support/Util/dbuf_string.c, support/Util/dbuf_string.h:
  added
* src/Makefile.in, src/SDCC.lex, src/SDCCast.c, src/SDCCast.h,
  src/SDCCcse.c, src/SDCCglobl.h, src/SDCCglue.c, src/SDCCglue.h,
  src/SDCCicode.c, src/SDCCicode.h, src/SDCCmain.c, src/SDCCmem.c,
  src/SDCCmem.h, src/SDCCpeeph.c, src/SDCCpeeph.h, src/SDCCsymt.c,
  src/SDCCsymt.h, src/SDCCutil.c, src/asm.c, src/asm.h, src/avr/gen.c,
  src/avr/main.c, src/ds390/gen.c, src/ds390/main.c, src/hc08/gen.c,
  src/hc08/main.c, src/izt/gen.c, src/mcs51/gen.c, src/mcs51/main.c,
  src/pic/device.c, src/pic/gen.c, src/pic/glue.c, src/pic/main.c,
  src/pic/ralloc.c, src/pic16/gen.c, src/pic16/glue.c,
  src/pic16/main.c, src/pic16/ralloc.c, src/port.h, src/src.dsp,
  src/xa51/gen.c, src/xa51/main.c, src/z80/gen.c, src/z80/main.c,
  support/Util/dbuf.c, support/Util/dbuf.h:
  modified

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4563 4a8a32a2-be11-0410-ad9d-d568d2c75423