Make 1990/tbr alt version that uses fgets not gets

This is so that the warning about gets() is not interspersed with the
initial output of the program (see below). I do want to note that if one
sends EOF it will segfault so to exit one should do ctrl-c (for
instance) (exit never worked). I will look at fixing that fault later on
to match the original code but this is good for now. When fixed (low
priority though) I will consider making the gets() version the alt but
probably not (I guess time will tell).

As for the interspersed output it looks like:

    $ warning: this program uses gets(), which is unsafe.
    # cursor is here

At the cursor I can either hit enter to get another prompt or I can
input a command but this is not immediately obvious.

Updated .gitignore to have tbr.alt.

1990/tbr/tbr.alt.c

@@ -0,0 +1,23 @@
+
+#define D ,close(
+
+char              *c,q              [512              ],m[              256
+],*v[           99], **u,        *i[3];int         f[2],p;main       (){for
+ (m[m        [60]=   m[62      ]=32   ]=m[*      m=124   [m]=       9]=6;
+  e(-8)     ,(c=fgets  (q,512,stdin),c[strlen(c)-1]='\0',1)||(exit   (0),0);r(0,0)
+   )for(    ;*++        c;);  }r(t,      o){    *i=i        [2]=    0;for
+     (u=v  +98           ;m[*--c]         ^9;m [*c]          &32  ?i[*c
+       &2]=                *u,u-             v^98              &&++u:
+
+	3	)if(!m[*c]){for(*++c=0;!m[*--c];);
+	*	--u= ++c;}u-v^98?strcmp(*u,"cd")?*c?pipe(f),o=f[
+	1	]:
+	4	,(p=fork())?e(p),o?r(o,0)D o)D*f):
+	1	,wait(0):(o?dup2(*f,0)D*f)D o):*i?
+	5	D 0),e(open(*i,0)):
+	9	,t?dup2(t,1)D t):i[
+	2	]?
+	6	D 1),e(creat(i[2],438)):
+	5	,e(execvp(*u,u))):e(chdir(u[1])*2):
+	3	;}e(x){x<0?write(2,"?\n$ "-x/4,2),x+1||(exit(1),0):
+	5	;}