Stop probing for pandoc and xelatex, they are not used any more.

configure

@@ -766,8 +766,6 @@ probe CFG_ANTLR4           antlr4
 probe CFG_GRUN             grun
 probe CFG_FLEX             flex
 probe CFG_BISON            bison
-probe CFG_PANDOC           pandoc
-probe CFG_XELATEX          xelatex
 probe CFG_GDB              gdb
 probe CFG_LLDB             lldb
 
@@ -826,26 +824,6 @@ step_msg "looking for target specific programs"
 
 probe CFG_ADB        adb
 
-if [ -n "$CFG_PANDOC" ]
-then
-    # Extract "MAJOR MINOR" from Pandoc's version number
-    PV_MAJOR_MINOR=$(pandoc --version | grep '^pandoc' |
-        sed -E 's/pandoc(.exe)? ([0-9]+)\.([0-9]+).*/\2 \3/')
-
-    MIN_PV_MAJOR="1"
-    MIN_PV_MINOR="9"
-
-    # these patterns are shell globs, *not* regexps
-    PV_MAJOR=${PV_MAJOR_MINOR% *}
-    PV_MINOR=${PV_MAJOR_MINOR#* }
-
-    if [ "$PV_MAJOR" -lt "$MIN_PV_MAJOR" ] || [ "$PV_MINOR" -lt "$MIN_PV_MINOR" ]
-    then
-        step_msg "pandoc $PV_MAJOR.$PV_MINOR is too old. Need at least $MIN_PV_MAJOR.$MIN_PV_MINOR. Disabling"
-        BAD_PANDOC=1
-    fi
-fi
-
 BIN_SUF=
 if [ "$CFG_OSTYPE" = "pc-windows-gnu" ] || [ "$CFG_OSTYPE" = "pc-windows-msvc" ]
 then
@@ -1775,12 +1753,6 @@ then
 fi
 
 
-if [ -n $BAD_PANDOC ]
-then
-    CFG_PANDOC=
-    putvar CFG_PANDOC
-fi
-
 putvar CFG_LLVM_SRC_DIR
 
 for t in $CFG_HOST