libffi alpha*-*-freebsd* configuration patch

[Loren James Rittle]

I can report that libffi works for alpha*-*-freebsd* when the obvious
enablement patch is applied to libffi/configure.in .  ./ffitest
reports: ``[...] Looks good. No surprises.''  Applied ``as obvious''
to the mainline after it checked as expected.

	* configure.in: Enable alpha*-*-freebsd*.
	* configure: Rebuilt.

Index: configure.in
===================================================================
RCS file: /cvs/gcc/gcc/libffi/configure.in,v
retrieving revision 1.19
diff -c -r1.19 configure.in
*** configure.in	2002/01/31 22:25:31	1.19
--- configure.in	2002/03/21 22:05:51
***************
*** 51,57 ****
  sparc*-sun-*) TARGET=SPARC; TARGETDIR=sparc;;
  sparc-*-linux*) TARGET=SPARC; TARGETDIR=sparc;;
  sparc64-*-linux*) TARGET=SPARC; TARGETDIR=sparc;;
! alpha*-*-linux* | alpha*-*-osf*) TARGET=ALPHA; TARGETDIR=alpha;;
  ia64*-*-*) TARGET=IA64; TARGETDIR=ia64;;
  m68k-*-linux*) TARGET=M68K; TARGETDIR=m68k;;
  powerpc-*-linux* | powerpc-*-sysv*) TARGET=POWERPC; TARGETDIR=powerpc;;
--- 51,57 ----
  sparc*-sun-*) TARGET=SPARC; TARGETDIR=sparc;;
  sparc-*-linux*) TARGET=SPARC; TARGETDIR=sparc;;
  sparc64-*-linux*) TARGET=SPARC; TARGETDIR=sparc;;
! alpha*-*-linux* | alpha*-*-osf* | alpha*-*-freebsd*) TARGET=ALPHA; TARGETDIR=alpha;;
  ia64*-*-*) TARGET=IA64; TARGETDIR=ia64;;
  m68k-*-linux*) TARGET=M68K; TARGETDIR=m68k;;
  powerpc-*-linux* | powerpc-*-sysv*) TARGET=POWERPC; TARGETDIR=powerpc;;