Improve fix of 1990/tbr

In particular the fix to make it more like the original. There was no
need to have the function prototypes at the top of the file.

I also added a couple -Wno- options to the CSILENCE variable in the
Makefile.

I also added to the Makefile so that make alt will build the alt version
(only functional difference is that there is gets() instead of fgets()).

1990/tbr/Makefile

@@ -39,7 +39,8 @@ include ../../var.mk
 # Common C compiler warnings to silence
 #
 CSILENCE= -Wno-char-subscripts -Wno-error -Wno-implicit-function-declaration \
-	-Wno-unused-value -Wno-deprecated-non-prototype -Wno-return-type
+	-Wno-unused-value -Wno-deprecated-non-prototype -Wno-return-type -Wno-implicit-int \
+	-Wno-empty-body
 
 # Common C compiler warning flags
 #
@@ -114,8 +115,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ=
-ALT_TARGET=
+ALT_OBJ= ${PROG}.alt.o
+ALT_TARGET= ${PROG}.alt
 
 
 #################

1990/tbr/tbr.c

@@ -1,4 +1,3 @@
-int e(int x),r(int t,int o);
 #define gets(x)fgets((x),512,stdin)
 #define exit(x) exit((x)),0
 #define D ,close(