pkg: move patches to patches/ subdirs

pkg/libcoap/patches/0001-Add-RIOT-Makefile.patch

pkg/libcoap/patches/0002-Add-config.h.patch

...ap/patches/0003-Remove-two-example-programs-in-root.patch

...es/0004-Eliminate-some-compiler-warnings-and-errors.patch

...ap/patches/0005-fix-old-style-function-declarations.patch

pkg/libcoap/patches/0006-debug-do-not-misuse-NDEBUG.patch

.../patches/0007-fix-option-parsing-with-debug-enabled.patch

pkg/libcoap/patches/0008-fix-debug-out-in-PDU-parsing.patch

.../patches/0009-delete-unused-function-check_opt_size.patch

pkg/micro-ecc/patches/0001-Add-RIOT-Makefile.patch

...cc/patches/0002-Include-RIOT-Hardware-RNG-interface.patch

...se-the-parameter-curve-instead-of-the-static-refere.patch

pkg/microcoap/patches/0001-Remove-unneeded-.c-files.patch

pkg/microcoap/patches/0002-Add-RIOT-Makefile.patch

...ches/0003-change-flag-from-DEBUG-to-MICROCOAP_DEBUG.patch

pkg/microcoap/patches/0004-increment_max_segments.patch

pkg/microcoap/patches/0005-fix-uninitialized-variable.patch

pkg/oonf_api/patches/0001-add-RIOT-support.patch

pkg/oonf_api/patches/0002-port-tests-to-riot.patch

pkg/oonf_api/patches/0003-port-example-to-riot.patch