Prepare build for CMake 4.
Fold and rationalize seds
https://bugs.gentoo.org/951901
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,7 @@
-cmake_minimum_required(VERSION 2.8)
+project(i2bits)
+cmake_minimum_required(VERSION 3.5)
 #set(CMAKE_VERBOSE_MAKEFILE ON)
-set(CMAKE_C_FLAGS "-std=c99 -Wall -Wextra -pedantic")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
 
 add_executable(i2bits i2bits.c)