gnutls 3.0.4 and mingw-w64 build issues

[Hoyt, David]

> make[3]: *** No rule to make target `libgnutls-28.def', needed by `all-am'.  Stop.

Re-running make without parallel builds (I was doing "make -j3") seemed to resolve this problem. Still might want to check what's going on, though.

Had to make similar Makefile.am fixes in the following (on top of my previous patch):

extra/Makefile.am: added "-I$(builddir)/../gl \" to AM_CPPFLAGS

Now getting the following error:

make[3]: Entering directory `~/native/build/gnutls-3.0.4-git/extra'
  CC     gnutls_openssl.lo
  CC     openssl_compat.lo
In file included from ../../../pkgs/gnutls-3.0.4-git/extra/openssl_compat.h:30:0,
                 from ../../../pkgs/gnutls-3.0.4-git/extra/openssl_compat.c:36:
../../../pkgs/gnutls-3.0.4-git/extra/includes/gnutls/openssl.h:95:26: error: expected ')' before numeric constant
../../../pkgs/gnutls-3.0.4-git/extra/includes/gnutls/openssl.h:283:3: error: expected identifier or '(' before 'LPCSTR'
../../../pkgs/gnutls-3.0.4-git/extra/includes/gnutls/openssl.h:283:3: error: expected ')' before numeric constant
../../../pkgs/gnutls-3.0.4-git/extra/includes/gnutls/openssl.h:284:3: error: expected identifier or '(' before 'LPCSTR'
../../../pkgs/gnutls-3.0.4-git/extra/includes/gnutls/openssl.h:284:3: error: expected ')' before numeric constant
make[3]: *** [openssl_compat.lo] Error 1