Update after gnulib changed: Fix link errors of gettextpo-1-prg on mingw.
* gettext-tools/configure.ac: Set the module indicator variables
GL_GTPO_GNULIB_{PUTC,FPUTC,FPUTS,FWRITE,FPRINTF} to 0.
* gettext-tools/libgettextpo/Makefile.am (config.h): Undefine REPLACE_FCHDIR
that is defined in the parent config.h.
