Document the sysconf header file.

include/sysconf.h.cmake

@@ -11,12 +11,18 @@
 
 #pragma once
 
-#cmakedefine DEBUG_BUILD
-
+// The default umask to use for files.
 #cmakedefine DEFUMASK @DEFUMASK@
-#cmakedefine01 HAVE_UMASK
+
+// Whether Anope was built in debug mode.
+#cmakedefine01 DEBUG_BUILD
+
+// Whether Anope was built with localization support.
 #cmakedefine01 HAVE_LOCALIZATION
 
+// Whether the umask() function is available.
+#cmakedefine01 HAVE_UMASK
+
 #ifdef _WIN32
 # define popen _popen
 # define pclose _pclose

src/misc.cpp

@@ -617,7 +617,7 @@ Anope::string Anope::VersionBuildString()
 #endif
 	Anope::string flags;
 
-#ifdef DEBUG_BUILD
+#if DEBUG_BUILD
 	flags += "D";
 #endif
 #ifdef VERSION_GIT