Drop -Werror flag fatal with clang 15.
Index: CompilerChecks.cmake
--- CompilerChecks.cmake.orig
+++ CompilerChecks.cmake
@@ -25,7 +25,6 @@ if (UNIX)
     #add_c_compiler_flag("-Wcast-qual" SUPPORTED_COMPILER_FLAGS)
     add_c_compiler_flag("-Werror=address" SUPPORTED_COMPILER_FLAGS)
     add_c_compiler_flag("-Wstrict-prototypes" SUPPORTED_COMPILER_FLAGS)
-    add_c_compiler_flag("-Werror=strict-prototypes" SUPPORTED_COMPILER_FLAGS)
     add_c_compiler_flag("-Wwrite-strings" SUPPORTED_COMPILER_FLAGS)
     add_c_compiler_flag("-Werror=write-strings" SUPPORTED_COMPILER_FLAGS)
     add_c_compiler_flag("-Werror-implicit-function-declaration" SUPPORTED_COMPILER_FLAGS)