gnu: Add mosaicatcher.

* gnu/packages/patches/mosaicatcher-unbundle-htslib.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/bioinformatics.scm (mosaicatcher): New variable.

gnu/packages/patches/mosaicatcher-unbundle-htslib.patch

@@ -0,0 +1,49 @@
+--- a/src/CMakeLists.txt	2021-05-28 13:07:25.655107983 +0200
++++ b/src/CMakeLists.txt	2021-05-28 13:09:55.764025497 +0200
+@@ -21,24 +21,6 @@
+ 
+ 
+ 
+-### Link HTSlib
+-
+-ExternalProject_Add(htslib
+-    PREFIX ${CMAKE_BINARY_DIR}/htslib
+-    GIT_REPOSITORY "https://github.com/samtools/htslib.git"
+-    GIT_TAG "1.3.1"
+-    UPDATE_COMMAND ""
+-    BUILD_IN_SOURCE 1
+-    CONFIGURE_COMMAND ""
+-    BUILD_COMMAND make
+-    INSTALL_COMMAND make install prefix=${CMAKE_BINARY_DIR}/htslib
+-    LOG_DOWNLOAD 1
+-)
+-link_directories (${CMAKE_BINARY_DIR}/htslib/lib)
+-include_directories (${CMAKE_BINARY_DIR}/htslib/include)
+-
+-
+-
+ ### Set version
+ 
+ # Get the current working branch
+@@ -64,13 +46,6 @@
+ 
+ # 2. Boost version from find_package (Boost_VERSION)
+ 
+-# 3. Get HTSlib version from git
+-execute_process(
+-    COMMAND git describe --always
+-    WORKING_DIRECTORY ${PROJECT_BINARY_DIR}/htslib
+-    OUTPUT_VARIABLE HTSLIB_VERSION
+-    OUTPUT_STRIP_TRAILING_WHITESPACE
+-)
+ set(HTSLIB_VERSION "1.3.1 ${HTSLIB_VERSION}")
+ 
+ # 4. write version.hpp file
+@@ -105,7 +80,6 @@
+ add_executable (mosaic main.cpp ${HEADER_FILES})
+ target_link_libraries (mosaic LINK_PUBLIC ${Boost_LIBRARIES})
+ target_link_libraries (mosaic LINK_PUBLIC hts)
+-add_dependencies (mosaic htslib)
+ 
+ 
+ ### Doxygen API documentation