Make byacc actually work when compiled against meslibc

This replaces the previous sed hackery with a proper patch, and removes
a few more libc functions that meslibc is missing.
The binary name is changed to "byacc" so it doesn't get overwritten by
heirloom yacc.

The bsearch() replacement code comes from an earlier version of byacc.

steps/byacc-20240109/pass1.kaem

@@ -22,28 +22,22 @@ tar xf ../src/${pkg}.tar
 rm -r ../src/
 cd ${pkg}
 
-# Prepare
+# Prepare and patch
 cp ../../files/Makefile .
-
-# meslibc has no fgetpos/fsetpos - emulate using fseek/ftell
-sed -i -e "s/fpos_t/long/" -e "s/fgetpos(f, &save_area.line_fpos) != 0/(save_area.line_fpos = ftell(f)) == -1/" \
-    -e "s/fsetpos(input_file, &save_area.line_fpos)/fseek(input_file, save_area.line_fpos, SEEK_SET)/" reader.c
-
-# likewise, meslibc has no tmpfile()
-sed -i -e "s/tmpfile()/fopen(label, \"w+\")/" main.c
+patch -Np0 -i ../../patches/meslibc.patch
 
 # Build yacc
 make CC=tcc AR=tcc\ -ar CFLAGS=-DMAXPATHLEN=100\ -DEILSEQ=84\ -DMB_LEN_MAX=100 LDFLAGS=-lgetopt\ -static RANLIB=true
 
 # Install yacc
-install yacc ${BINDIR}
+install yacc ${BINDIR}/byacc
 
 cd ../..
 
 # Checksums
 if match x${UPDATE_CHECKSUMS} xTrue; then
     sha256sum -o ${pkg}.checksums \
-        /usr/bin/yacc
+        /usr/bin/byacc
 
     install ${pkg}.checksums ${SRCDIR}
 else