Work around G++ 8 warnings

The previous G++-8 cleanup did not include unit tests.

Author: tautschnig

Diff for: src/util/small_map.h

@@ -146,7 +146,7 @@ class small_mapt
     if(n == 0)
       return nullptr;
 
-    T *mem = (T *)realloc(ptr, sizeof(T) * n);
+    T *mem = (T *)realloc((char *)ptr, sizeof(T) * n);
 
     if(!mem)
       throw std::bad_alloc();
@@ -486,7 +486,7 @@ class small_mapt
       std::size_t n = size();
       if(ii < n - 1)
       {
-        memmove(p + ii, p + ii + 1, sizeof(T) * (n - ii - 1));
+        memmove((char *)(p + ii), p + ii + 1, sizeof(T) * (n - ii - 1));
       }
 
       p = allocate(p, n - 1);

Diff for: unit/testing-utils/catch.hpp

@@ -2245,7 +2245,7 @@ namespace Catch {
                 static_cast<void>(expr); \
                 __catchResult.captureResult( Catch::ResultWas::DidntThrowException ); \
             } \
-            catch( exceptionType ) { \
+            catch( const exceptionType & ) { \
                 __catchResult.captureResult( Catch::ResultWas::Ok ); \
             } \
             catch( ... ) { \