lib: delete obsolete inline keyword detection

C99 supports the inline keyword, this is now not useful. Signed-off-by: GitHub <noreply@github.com>

Author: alanxz

CMakeLists.txt

@@ -37,7 +37,6 @@ if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
 endif()
 
-include(TestCInline)
 include(CheckSymbolExists)
 include(CheckLibraryExists)
 include(CMakePushCheckState)

cmake/TestCInline.cmake

@@ -1,10 +1,6 @@
 #ifndef CONFIG_H
 #define CONFIG_H
 
-#ifndef __cplusplus
-# define inline ${C_INLINE_KEYWORD}
-#endif
-
 #cmakedefine HAVE_SELECT
 
 #cmakedefine HAVE_POLL