Remove unused CMake file.

double-conversion/CMakeLists.txt

diff --git a/double-conversion/CMakeLists.txt b/double-conversion/CMakeLists.txt
deleted file mode 100644
index 47bd52a..0000000
--- a/double-conversion/CMakeLists.txt
+++ /dev/null
@@ -1,33 +0,0 @@
-target_include_directories(double-conversion PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/..>)
-
-# Add fPIC on x86_64 when supported.
-include(CheckCXXCompilerFlag)
-check_cxx_compiler_flag(-fPIC CXX_HAS_FPIC)
-
-if(CXX_HAS_FPIC AND CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64")
-  set_target_properties(double-conversion PROPERTIES COMPILE_FLAGS "-fPIC")
-endif()
-
-#
-# associates the list of headers with the library
-# for the purposes of installation/import into other projects
-set_target_properties(double-conversion
-    PROPERTIES PUBLIC_HEADER "${headers}")
-
-if (BUILD_SHARED_LIBS)
-  set_target_properties(double-conversion
-    PROPERTIES VERSION ${double-conversion_SOVERSION}
-               SOVERSION ${double-conversion_SOVERSION_MAJOR})
-endif()
-
-#
-# install command to set up library install
-# given the above PUBLIC_HEADER property set, this
-# pulls along all the header files with the library.
-install(TARGETS double-conversion
-  EXPORT double-conversionLibraryDepends
-  RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}" COMPONENT bin
-  LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}" COMPONENT shlib
-  ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}" COMPONENT lib
-  PUBLIC_HEADER DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/double-conversion"
-  COMPONENT dev)