contrib: Explain explicit header guards
They were added in #925 and deserve a comment.
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@ -51,6 +51,10 @@
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#ifndef SECP256K1_CONTRIB_LAX_DER_PARSING_H
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#ifndef SECP256K1_CONTRIB_LAX_DER_PARSING_H
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#define SECP256K1_CONTRIB_LAX_DER_PARSING_H
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#define SECP256K1_CONTRIB_LAX_DER_PARSING_H
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/* #include secp256k1.h only when it hasn't been included yet.
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This enables this file to be #included directly in other project
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files (such as tests.c) without the need to set an explicit -I flag,
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which would be necessary to locate secp256k1.h. */
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#ifndef SECP256K1_H
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#ifndef SECP256K1_H
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#include <secp256k1.h>
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#include <secp256k1.h>
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#endif
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#endif
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@ -28,6 +28,10 @@
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#ifndef SECP256K1_CONTRIB_BER_PRIVATEKEY_H
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#ifndef SECP256K1_CONTRIB_BER_PRIVATEKEY_H
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#define SECP256K1_CONTRIB_BER_PRIVATEKEY_H
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#define SECP256K1_CONTRIB_BER_PRIVATEKEY_H
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/* #include secp256k1.h only when it hasn't been included yet.
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This enables this file to be #included directly in other project
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files (such as tests.c) without the need to set an explicit -I flag,
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which would be necessary to locate secp256k1.h. */
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#ifndef SECP256K1_H
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#ifndef SECP256K1_H
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#include <secp256k1.h>
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#include <secp256k1.h>
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#endif
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#endif
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