DSP: Add "DSP" UnitTest category to dsp module UnitTests

modules/juce_dsp/frequency/juce_FFT_test.cpp

@@ -31,7 +31,7 @@ namespace dsp
 
 struct FFTUnitTest  : public UnitTest
 {
-    FFTUnitTest()  : UnitTest("FFT") {}
+    FFTUnitTest()  : UnitTest ("FFT", "DSP") {}
 
     static void fillRandom (Random& random, Complex<float>* buffer, size_t n)
     {

modules/juce_dsp/maths/juce_Matrix_test.cpp

@@ -31,7 +31,7 @@ namespace dsp
 
 struct LinearAlgebraUnitTest  : public UnitTest
 {
-    LinearAlgebraUnitTest()  : UnitTest("Linear Algebra UnitTests") {}
+    LinearAlgebraUnitTest()  : UnitTest ("Linear Algebra UnitTests", "DSP") {}
 
     struct AdditionTest
     {

modules/juce_dsp/processors/juce_FIRFilter_test.cpp

@@ -50,6 +50,7 @@ class FIRFilterTest : public UnitTest
         }
     };
 
+   #if JUCE_USE_SIMD
     template <typename Type>
     struct Helpers<SIMDRegister<Type>>
     {
@@ -65,6 +66,7 @@ class FIRFilterTest : public UnitTest
                                                        n * SIMDRegister<Type>::size());
         }
     };
+   #endif
 
     template <typename Type>
     static void fillRandom (Random& random, Type* buffer, size_t n) { Helpers<Type>::fillRandom (random, buffer, n); }
@@ -85,8 +87,15 @@ class FIRFilterTest : public UnitTest
         }
 
         HeapBlock<SampleType> scratchBuffer (numCoefficients
-                                             + (SIMDRegister<NumericType>::SIMDRegisterSize / sizeof (SampleType)));
+                                            #if JUCE_USE_SIMD
+                                             + (SIMDRegister<NumericType>::SIMDRegisterSize / sizeof (SampleType))
+                                            #endif
+                                             );
+       #if JUCE_USE_SIMD
         SampleType* buffer = reinterpret_cast<SampleType*> (SIMDRegister<NumericType>::getNextSIMDAlignedPtr (reinterpret_cast<NumericType*> (scratchBuffer.getData())));
+       #else
+        SampleType* buffer = scratchBuffer.getData();
+       #endif
 
         zeromem (buffer, sizeof (SampleType) * numCoefficients);
 
@@ -188,13 +197,15 @@ class FIRFilterTest : public UnitTest
 
         runTestForType<TheTest, float, float> ();
         runTestForType<TheTest, double, double>();
+       #if JUCE_USE_SIMD
         runTestForType<TheTest, SIMDRegister<float>, float> ();
         runTestForType<TheTest, SIMDRegister<double>, double>();
+       #endif
     }
 
 
 public:
-    FIRFilterTest() : UnitTest ("FIR Filter") {}
+    FIRFilterTest() : UnitTest ("FIR Filter", "DSP") {}
 
     void runTest() override
     {