gnu: cdrkit-libre: Fix cross-compiling.

* gnu/packages/cdrom.scm (cdrkit-libre)[source]: Add patch.
* gnu/packages/patches/cdrkit-libre-cross-compile.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.

gnu/local.mk

@@ -925,6 +925,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/catdoc-CVE-2017-11110.patch		\
   %D%/packages/patches/circos-remove-findbin.patch		\
   %D%/packages/patches/cdparanoia-fpic.patch			\
+  %D%/packages/patches/cdrkit-libre-cross-compile.patch	\
   %D%/packages/patches/cdrtools-3.01-mkisofs-isoinfo.patch 	\
   %D%/packages/patches/ceph-disable-cpu-optimizations.patch	\
   %D%/packages/patches/ceph-boost-compat.patch			\

gnu/packages/cdrom.scm

@@ -929,6 +929,7 @@ Supported extensions to ISO 9660 are Rock Ridge, Joliet, AAIP, zisofs.")
               (sha256
                (base32
                 "0g2zyzb56czh429qy87lvaddzjnlcq8c616ddxsmsshz3clhyzrh"))
+              (patches (search-patches "cdrkit-libre-cross-compile.patch"))
               (modules '((guix build utils)))
               (snippet
                 #~(begin

gnu/packages/patches/cdrkit-libre-cross-compile.patch

@@ -0,0 +1,32 @@
+Patch extracted from a set of patches to cross-compile ffmeg and dependencies for mingw-w64.
+https://github.com/Warblefly/MultimediaTools-mingw-w64/commit/01e30a17637b67afd65c1e24302f8daf94b19b32#diff-503bd595ad2a49840cc56acdb3432487a20a0acb7981ce83be51fe311216de8f
+
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index 99a69fd..e5ba8a7 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -35,8 +35,6 @@ endif(VA_LIST_IS_ARRAY)
+ INCLUDE(TestBigEndian)
+ TEST_BIG_ENDIAN(WORDS_BIGENDIAN)
+ 
+-TRY_RUN(BITFIELDS_HTOL TEST_DUMMY ${CMAKE_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/test_BITFIELDS_HTOL.c)
+-
+ INCLUDE(CheckIncludeFiles)
+ 
+ #SET(CMAKE_REQUIRED_INCLUDES "/usr/include;/usr/local/include")
+diff --git a/include/xconfig.h.in b/include/xconfig.h.in
+index c130600..476c00b 100644
+--- a/include/xconfig.h.in
++++ b/include/xconfig.h.in
+@@ -233,7 +233,11 @@
+ /* If using network byte order             */
+ #cmakedefine WORDS_BIGENDIAN
+ /* If high bits come first in structures   */
+-#cmakedefine BITFIELDS_HTOL
++#ifdef WORDS_BIGENDIAN
++#define BITFIELDS_HTOL
++#else
++#define BITFIELDS_LTOH
++#endif
+ #define	HAVE_C_BIGENDIAN	/* Flag that WORDS_BIGENDIAN test was done */
+ #define	HAVE_C_BITFIELDS	/* Flag that BITFIELDS_HTOL test was done  */