[bash] Improve mawk detection (#3463)

* Use the all-compatible mawk `-W version` option.
  #3313 (comment).
* Run the command and not a function consistently with #3462.

The version check bash code relies on the following mawk source code,
extracted from mawk 1.3.4 20230322.

```
version.c:
18-  #include "init.h"
19-  #include "patchlev.h"
20-
21:  #define	 VERSION_STRING	 \
22-    "mawk %d.%d%s %s\n\
23-  Copyright 2008-2022,2023, Thomas E. Dickey\n\
24-  Copyright 1991-1996,2014, Michael D. Brennan\n\n"
....
30-  void
31-  print_version(FILE *fp)
32-  {
33:      fprintf(fp, VERSION_STRING, PATCH_BASE, PATCH_LEVEL, PATCH_STRING, DATE_STRING);
34-      fflush(fp);
35-
36-  #define SHOW_RANDOM "random-funcs:"

patchlev.h:
13-  /*
14-   * $MawkId: patchlev.h,v 1.128 2023/03/23 00:23:57 tom Exp $
15-   */
16:  #define  PATCH_BASE	1
17-  #define  PATCH_LEVEL	3
18-  #define  PATCH_STRING	".4"
19-  #define  DATE_STRING    "20230322"
```

Co-authored-by: Junegunn Choi <[email protected]>

shell/key-bindings.bash

@@ -56,7 +56,7 @@ if command -v perl > /dev/null; then
     output=$(
       set +o pipefail
       builtin fc -lnr -2147483648 |
-        last_hist=$(HISTTIMEFORMAT='' builtin history 1) perl -n -l0 -e "$script" |
+        last_hist=$(HISTTIMEFORMAT='' builtin history 1) command perl -n -l0 -e "$script" |
         FZF_DEFAULT_OPTS="$opts" $(__fzfcmd) --query "$READLINE_LINE"
     ) || return
     READLINE_LINE=${output#*$'\t'}
@@ -66,16 +66,14 @@ if command -v perl > /dev/null; then
       READLINE_POINT=0x7fffffff
     fi
   }
-else # awk
+else # awk - fallback for POSIX systems
   __fzf_history__() {
-    local output opts script
+    local output opts script n x y z d
     if [[ -z $__fzf_awk ]]; then
       __fzf_awk=awk
-      # if installed, mawk is faster
-      command -v mawk > /dev/null &&
-        mawk --version |          # at least 1.3.4
-          awk 'NR == 1 { split($2, a, "."); v=(a[1]*1000000+ a[2]*1000+ a[3]*1); exit !(v >= 1003004) }' &&
-          __fzf_awk=mawk
+      # choose the faster mawk if: it's installed && build date >= 20230322 && version >= 1.3.4
+      IFS=' .' read n x y z d <<< $(command mawk -W version 2> /dev/null)
+      [[ $n == mawk ]] && (( d >= 20230302 && (x *1000 +y) *1000 +z >= 1003004 )) && __fzf_awk=mawk
     fi
     opts="--height ${FZF_TMUX_HEIGHT:-40%} --bind=ctrl-z:ignore ${FZF_DEFAULT_OPTS-} -n2..,.. --scheme=history --bind=ctrl-r:toggle-sort ${FZF_CTRL_R_OPTS-} +m --read0"
     [[ $(HISTTIMEFORMAT='' builtin history 1) =~ [[:digit:]]+ ]]    # how many history entries
@@ -87,7 +85,7 @@ else # awk
     output=$(
       set +o pipefail
       builtin fc -lnr -2147483648 2> /dev/null |   # ( $'\t '<lines>$'\n' )* ; <lines> ::= [^\n]* ( $'\n'<lines> )*
-        $__fzf_awk "$script"                          |   # ( <counter>$'\t'<lines>$'\000' )*
+        command $__fzf_awk "$script"           |   # ( <counter>$'\t'<lines>$'\000' )*
         FZF_DEFAULT_OPTS="$opts" $(__fzfcmd) --query "$READLINE_LINE"
     ) || return
     READLINE_LINE=${output#*$'\t'}