* xconfig/i386sco: Add HAVE_STRSTR to avoid ANSI bdeath.

* xconfig/tahoe:  Add REGEX, which seems to be missing.

gdb/config/i386sco.mh

@@ -2,6 +2,7 @@
 XDEPFILES= infptrace.o coredep.o i386-xdep.o i387-tdep.o
 XM_FILE= xm-i386sco.h
 XM_CLIBS= -lPW
+XM_FLAGS=-DHAVE_STRSTR
 SYSV_DEFINE=-DSYSV
 REGEX=regex.o
 REGEX1=regex.o

gdb/config/tahoe.mh

@@ -1,3 +1,5 @@
 # Host: CCI or Harris Tahoe running BSD Unix
 XDEPFILES= infptrace.o coredep.o
+REGEX=regex.o
+REGEX1=regex.o
 XM_FILE= xm-tahoe.h