zlib: Remove /usr/bin from LDFLAGS in pkgconfig file.
It fix error while linking glib2:
/ld: warning: cannot find entry symbol __msys_dll_entry@12; defaulting to 6aac1000ertr000145.o:(.rdata+0x0): undefined reference to `_pei386_runtime_relocator'
glib2: Add patches from cygwin. Install missing files in glib2-devel.
mc: Update to 4.8.11
Add itstool package.
Add gtk-doc package.