CMB: Fix compile on OSX

Change-Id: Iad4ac96233f46d9f76894ab06f8ee55530c1e739
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/tools/codemodelbackend/ipcsource/projectpartsdonotexistexception.h

@@ -46,7 +46,7 @@ public:
 
     const char *what() const Q_DECL_NOEXCEPT override;
 
-#ifdef __GNUC__
+#if defined(__GNUC__) && !defined(__clang__)
 #  if !__GNUC_PREREQ(4,8)
     ~ProjectPartDoNotExistException() noexcept {}
 #  endif

src/tools/codemodelbackend/ipcsource/translationunitdoesnotexistexception.h

@@ -45,7 +45,7 @@ public:
 
     const char *what() const Q_DECL_NOEXCEPT override;
 
-#ifdef __GNUC__
+#if defined(__GNUC__) && !defined(__clang__)
 #  if !__GNUC_PREREQ(4,8)
     ~TranslationUnitDoesNotExistException() noexcept {}
 #  endif

src/tools/codemodelbackend/ipcsource/translationunitfilenotexitexception.h

@@ -46,7 +46,7 @@ public:
 
     const char *what() const Q_DECL_NOEXCEPT override;
 
-#ifdef __GNUC__
+#if defined(__GNUC__) && !defined(__clang__)
 #  if !__GNUC_PREREQ(4,8)
     ~TranslationUnitFileNotExitsException() noexcept {}
 #  endif

src/tools/codemodelbackend/ipcsource/translationunitisnullexception.h

@@ -42,7 +42,7 @@ class TranslationUnitIsNullException : public std::exception
 public:
     const char *what() const Q_DECL_NOEXCEPT override;
 
-#ifdef __GNUC__
+#if defined(__GNUC__) && !defined(__clang__)
 #  if !__GNUC_PREREQ(4,8)
     ~TranslationUnitIsNullException() noexcept {}
 #  endif

src/tools/codemodelbackend/ipcsource/translationunitparseerrorexception.h

@@ -47,7 +47,7 @@ public:
 
     const char *what() const Q_DECL_NOEXCEPT override;
 
-#ifdef __GNUC__
+#if defined(__GNUC__) && !defined(__clang__)
 #  if !__GNUC_PREREQ(4,8)
     ~TranslationUnitParseErrorException() noexcept {}
 #  endif