[Bug 247976] pkg-config produces icorrect linkage information about libncursesw

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247976

            Bug ID: 247976
           Summary: pkg-config produces icorrect linkage information about
                    libncursesw
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: internalmike at gmail.com

Consider the following program:

```c
#include <locale.h>
#include <curses.h>

int main() {
    setlocale(LC_ALL, "");
    initscr();
    cbreak(); 
    noecho(); 
    keypad(stdscr, true);
    clear();
    move(10, 10);
    addnstr("x", 1);
    move(10, 10);
    insnstr("Привет", 2);
    getch();
    endwin();
    return 0;
}
```

If you compile it in direct way and run resulting binary:

```sh
$ cc main.c -o main -lncursesw
$ ./main
```
you will get correct-working program: "./main" will display "Пx" on screen.
(Please, consider [this stackoverflow
answer](https://stackoverflow.com/questions/62897474/what-is-the-exact-meaning-of-the-second-parameter-of-the-insnstr-ncurses-funct/62898381#62898381)
if you have doubts about expected ncurses behavior.)

But pkg-config provides the following info about linkage:

```sh
$ pkg-config --libs ncursesw
-L/usr/local/lib -Wl,-rpath,/usr/local/lib -lncursesw -ltinfow
```

And if you compile and run the program with all this flags:

```sh
$ cc -L/usr/local/lib -Wl,-rpath,/usr/local/lib -lncursesw -ltinfow main.c -o
main -lncursesw
$ ./main
```
you will get very different result on screen: "Прx".

If you remove `-L/usr/local/lib` part, you get correct behavior back.

I believe, pkg-config should provide information, which does not broke
programs.

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