botan: make it compile with g++ 4.6

src/libs/3rdparty/botan/build/botan/asn1_oid.h

@@ -63,7 +63,7 @@ class BOTAN_DLL OID : public ASN1_Object
       * Construct an OID from a string.
       * @param str a string in the form "a.b.c" etc., where a,b,c are numbers
       */
-      OID(const std::string& str = "");
+      OID(const std::string& str = std::string());
    private:
       std::vector<u32bit> id;
    };

src/libs/3rdparty/botan/build/botan/cvc_gen_cert.h

@@ -15,6 +15,7 @@
 #include <botan/pubkey.h>
 #include <botan/ecdsa_sig.h>
 #include <string>
+#include <memory>
 #include <assert.h>
 
 namespace Botan {

src/libs/3rdparty/botan/build/botan/eac_asn_obj.h

@@ -115,7 +115,7 @@ class BOTAN_DLL ASN1_Ced : public EAC_Time
       * @param str a string in the format "yyyy mm dd",
       * e.g. "2007 08 01"
       */
-      ASN1_Ced(std::string const& str = "");
+      ASN1_Ced(std::string const& str = std::string());
 
       /**
       * Construct a CED from a timer value.
@@ -146,7 +146,7 @@ class BOTAN_DLL ASN1_Cex : public EAC_Time
       * @param str a string in the format "yyyy mm dd",
       * e.g. "2007 08 01"
       */
-      ASN1_Cex(std::string const& str="");
+      ASN1_Cex(std::string const& str=std::string());
 
       /**
       * Construct a CED from a timer value.
@@ -207,7 +207,7 @@ class BOTAN_DLL ASN1_Car : public ASN1_EAC_String
       * Create a CAR with the specified content.
       * @param str the CAR value
       */
-      ASN1_Car(std::string const& str = "");
+      ASN1_Car(std::string const& str = std::string());
    };
 
 /**
@@ -220,7 +220,7 @@ class BOTAN_DLL ASN1_Chr : public ASN1_EAC_String
       * Create a CHR with the specified content.
       * @param str the CHR value
       */
-      ASN1_Chr(std::string const& str = "");
+      ASN1_Chr(std::string const& str = std::string());
    };
 
 /*