Fix fix on 1990/dds + make it use fgets()

The Makefile had -include stdio.h which made it fail to compile under
macOS (mismatch type of fopen()). I removed the prototype in the code.

I also made it use fgets() instead of gets() to make it safer.

1990/dds/dds.c

@@ -7,12 +7,12 @@
 #define _ return
 #define R 999
 typedef char*A;int*C,E[R],L[R],M[R],P[R],l,i,j;char B[R],F[2];A m[12*R],malloc
-(),p,q,x,y,z,s,d,f,fopen();A Q(s,o)A s,o;{for(x=s;*x;x++){for(y=x,z=o;*z&&*y==
-*z;y++)z++;if(z>o&&!*z)_ x;}_	0;}main(){m[11*R]="E";while(puts("Ok"),gets(B)
-)switch(*B){X'R':C=E;l=1;for(i=0;i<R;P[i++]=0);while(l){while(!(s=m[l]))l++;if
+(),p,q,x,y,z,s,d;FILE *f;A Q(s,o)A s,o;{for(x=s;*x;x++){for(y=x,z=o;*z&&*y==
+*z;y++)z++;if(z>o&&!*z)_ x;}_	0;}main(){m[11*R]="E";while(puts("Ok"),fgets(B,R,stdin),
+B[strlen(B)-1]='\0',1)switch(*B){X'R':C=E;l=1;for(i=0;i<R;P[i++]=0);while(l){while(!(s=m[l]))l++;if
 (!Q(s,"\"")){U("<>",'#');U("<=",'$');U(">=",'!');}d=B;while(*F=*s){*s=='"'&&j
 ++;if(j&1||!Q(" \t",F))*d++=*s;s++;}*d--=j=0;if(B[1]!='=')switch(*B){X'E':l=-1
-X'R':B[2]!='M'&&(l=*--C)X'I':B[1]=='N'?gets(p=B),P[*d]=S():(*(q=Q(B,"TH"))=0,p
+X'R':B[2]!='M'&&(l=*--C)X'I':B[1]=='N'?fgets(p=B,R,stdin),P[*d]=S():(*(q=Q(B,"TH"))=0,p
 =B+2,S()&&(p=q+4,l=S()-1))X'P':B[5]=='"'?*d=0,puts(B+6):(p=B+5,printf("%d\n",S
 ()))X'G':p=B+4,B[2]=='S'&&(*C++=l,p++),l=S()-1 X'F':*(q=Q(B,"TO"))=0;p=B+5;P[i
 =B[3]]=S();p=q+2;M[i]=S();L[i]=l X'N':++P[*d]<=M[*d]&&(l=L[*d]);}else p=B+2,P[