CFLAG, not CFLAGS

INSTALL

@@ -158,7 +158,7 @@
      If a test fails, look at the output.  There may be reasons for
      the failure that isn't a problem in OpenSSL itself (like a missing
      or malfunctioning bc).  If it is a problem with OpenSSL itself,
-     try removing any compiler optimization flags from the CFLAGS line
+     try removing any compiler optimization flags from the CFLAG line
      in Makefile.ssl and run "make clean; make". Please send a bug
      report to <openssl-bugs@openssl.org>, including the output of
      "make report" in order to be added to the request tracker at