Remove unused <zlib.h> inclusions

Remove remaining references to bcf_p1_fp_lk, which has been unused
since the undocumented call -K option was removed in 0.1.0-33-gc4172c5.
After that, neither source file actually uses anything from <zlib.h>.

prob1.c

@@ -30,19 +30,12 @@ THE SOFTWARE.  */
 #include <errno.h>
 #include <assert.h>
 #include <limits.h>
-#include <zlib.h>
 #include "prob1.h"
 
-// #include "kstring.h"
-// #include "kseq.h"
-// KSTREAM_INIT(gzFile, gzread, 16384)
-
 #define MC_MAX_EM_ITER 16
 #define MC_EM_EPS 1e-5
 #define MC_DEF_INDEL 0.15
 
-gzFile bcf_p1_fp_lk;
-
 void bcf_p1_indel_prior(bcf_p1aux_t *ma, double x)
 {
     int i;
@@ -304,8 +297,6 @@ static void mc_cal_y_core(bcf_p1aux_t *ma, int beg)
         }
     }
     if (z[0] != ma->z) memcpy(ma->z, z[0], sizeof(double) * (ma->M + 1));
-    if (bcf_p1_fp_lk)
-        gzwrite(bcf_p1_fp_lk, ma->z, sizeof(double) * (ma->M + 1));
 }
 
 static void mc_cal_y(bcf_p1aux_t *ma)

vcfcall.c

@@ -32,7 +32,6 @@ THE SOFTWARE.  */
 #include <math.h>
 #include <htslib/vcf.h>
 #include <time.h>
-#include <zlib.h>
 #include <stdarg.h>
 #include <htslib/kfunc.h>
 #include <htslib/synced_bcf_reader.h>