cmake: Use -Wpedantic and remove -pedantic-errors

We get -Werror if -DPICKY_DEVELOPER=ON is set.

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

CompilerChecks.cmake

@@ -17,8 +17,7 @@ if (UNIX)
     endif()
 
     add_c_compiler_flag("-std=gnu99" SUPPORTED_COMPILER_FLAGS)
-    add_c_compiler_flag("-pedantic" SUPPORTED_COMPILER_FLAGS)
-    add_c_compiler_flag("-pedantic-errors" SUPPORTED_COMPILER_FLAGS)
+    add_c_compiler_flag("-Wpedantic" SUPPORTED_COMPILER_FLAGS)
     add_c_compiler_flag("-Wall" SUPPORTED_COMPILER_FLAGS)
     add_c_compiler_flag("-Wshadow" SUPPORTED_COMPILER_FLAGS)
     add_c_compiler_flag("-Wmissing-prototypes" SUPPORTED_COMPILER_FLAGS)