rip out getopt and replace it with yarg.

yarg is a public domain argument parser written by the author of bzip3.

CMakeLists.txt

@@ -88,10 +88,6 @@ install(
 if(BZIP3_BUILD_APPS)
   add_executable(bzip3)
   target_sources(bzip3 PRIVATE src/main.c)
-  check_symbol_exists(getopt_long "getopt.h" HAVE_GETOPT_LONG)
-  if(HAVE_GETOPT_LONG)
-    target_compile_definitions(bzip3 PRIVATE HAVE_GETOPT_LONG)
-  endif()
   if(BZIP3_ENABLE_STATIC_EXE)
     if(BUILD_SHARED_LIBS)
       message(

Makefile.am

@@ -9,7 +9,7 @@ pkgconfig_DATA = bzip3.pc
 include_HEADERS = include/libbz3.h
 noinst_HEADERS = include/common.h \
 						 include/libsais.h \
-						 include/getopt-shim.h
+						 include/yarg.h
 
 lib_LTLIBRARIES = libbzip3.la
 libbzip3_la_SOURCES = src/libbz3.c

README.md

@@ -133,7 +133,6 @@ A breakdown of components and their licenses follows:
 - (compile-time) `build-aux/ax_check_compile_flag.m4`: Copyright 2008, Guido U. Draheim ([email protected]), 2011, Maarten Bosmans ([email protected]); FSFAP
 - (compile-time) `build-aux/git-version-gen`: Copyright 2007-2012, Free Software Foundation, Inc; GPLv3
 - (runtime) `bz3grep`: Copyright 2003, Thomas Klausner; BSD-2-clause
-- (runtime) `include/getopt-shim.h`: Copyright 2005-2014, Rich Felker; Expat
 
 `bzip3` as a whole is licensed under LGPLv3 only. It is not dual-licensed under LGPLv3 and Apache 2.0.
 

configure.ac

@@ -16,9 +16,6 @@ LT_INIT
 PKG_PROG_PKG_CONFIG
 PKG_INSTALLDIR
 
-AC_CHECK_HEADERS([getopt.h])
-AC_CHECK_FUNCS([getopt_long])
-
 AC_C_RESTRICT
 
 AC_ARG_WITH([pthread],