updated files from texlive, and a patch config.h for mingw32

source/Makefile.in

source/configure

source/configure.ac

source/libs/Makefile.in

source/libs/configure

source/libs/libpng/configure

source/libs/libpng/configure.ac

source/m4/kpse-common.m4

source/m4/kpse-gd-flags.m4

source/m4/kpse-kpathsea-flags.m4

source/m4/kpse-pkgs.m4

source/m4/kpse-setup.m4

source/m4/kpse-web2c.m4

source/texk/Makefile.in

source/texk/configure

source/texk/kpathsea/Makefile.am

source/texk/kpathsea/Makefile.in

source/texk/kpathsea/ac/web2c.ac

source/texk/kpathsea/config.h

source/texk/kpathsea/configure