CMakeLists.txt: fix build without C++

lwrb is written in c, so only enforce a c compiler

Seen while compiling fluent-bit on buildroot.

Signed-off-by: Thomas Devoogdt <thomas@devoogdt.com>

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.22)
 
 # Setup project
-project(LwLibPROJECT)
+project(LwLibPROJECT C)
 
 if(NOT PROJECT_IS_TOP_LEVEL)
     add_subdirectory(lwrb)
@@ -37,4 +37,4 @@ else()
     # Add subdir with lwrb and link to project
     add_subdirectory(lwrb)
     target_link_libraries(${PROJECT_NAME} lwrb)
-endif()
+endif()