Get alloca using ALLOCA, not libucb.a.

From-SVN: r2200

gcc/config/i386/x-ncr3000

@@ -16,17 +16,12 @@ OLDCC = /usr/ccs/ATT/cc
 
 # The rest is just x-i386v4.
 
-# The svr4 reference port for the i386 contains an alloca.o routine
-# in /usr/ucblib/libucb.a, but we can't just try to get that by
-# setting CLIB to /usr/ucblib/libucb.a because (unfortunately)
-# there are a lot of other routines in libucb.a which are supposed
-# to be the Berkeley versions of library routines normally found in
-# libc.a and many of these Berkeley versions are badly broken.  Thus,
-# if we try to link programs with libucb.a before libc.a, those
-# programs tend to crash.  To avoid this, we link with libc.a *before*
-# linking with libucb.a.
-
-CLIB=-lc /usr/ucblib/libucb.a
+# Some versions of SVR4 have an alloca in /usr/ucblib/libucb.a, and if we are
+# careful to link that in after libc we can use it, but since newer versions of
+# SVR4 are dropping libucb, it is better to just use the portable C version for
+# bootstrapping.  Do this by defining ALLOCA.
+
+ALLOCA = alloca.o
 
 # We used to build all stages *without* shared libraries because that may make
 # debugging the compiler easier (until there is a GDB which supports