Set #pragma once for build.h

The header is included all over the place and hence also multiple times
in the same translation unit which triggers -Wredundant-decls, beside
being pointless, so we just tell the pre-processor with a slightly more
modern form of a header guard that once is enough.

As a bonus, this commit keeps the 'DO NOT EDIT' remark as intended.

diff --git a/support/configure.inc b/support/configure.inc
index 821102fbbfa4aa8171844935e9dde2234cbd684a..905685cb5d4ea7d1b9cd190dbb1c6ea6ce09832b 100755 (executable)
--- a/support/configure.inc
+++ b/support/configure.inc
@@ -527,10 +527,11 @@ EOF
   CONFIG_H="${BUILDDIR}/build.h"
   cat > "${CONFIG_H}" <<EOF
 // Automatically generated by configure - DO NOT EDIT!
+#pragma once
 EOF
 
   # Create Platform defines
-  cat > ${CONFIG_H} <<EOF
+  cat >> ${CONFIG_H} <<EOF
 #define PLATFORM_$(toupper ${PLATFORM}) 1
 EOF