build: move library flags from EXTRA_LDFLAGS to LIBS

LIBS is the variable that Autoconf uses to put library flags.  From the
manual of GNU Autoconf (version 2.69):

>  -- Variable: LDFLAGS
>
>      [...]
>
>      This variable's contents should contain options like '-s' and '-L'
>      that affect only the behavior of the linker.  Please see the
>      explanation of 'CFLAGS' for what you can do if an option also
>      affects other phases of the compiler.
>
>      Don't use this variable to pass library names ('-l') to the linker;
>      use 'LIBS' instead.
>
>  -- Variable: LIBS
>
>      '-l' options to pass to the linker.  The default value is empty,
>      but some Autoconf macros may prepend extra libraries to this
>      variable if those libraries are found and provide necessary
>      functions, see *note Libraries::.  'configure' uses this variable
>      when linking programs to test for C, C++, Objective C, Objective
>      C++, Fortran, and Go features.

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