Fixed include statement

src/core/ActionWithArguments.cpp

@@ -27,7 +27,7 @@
 #include <iostream>
 #ifdef __PLUMED_HAS_CREGEX
 #include <cstring>
-#include "regex.h"
+#include <regex.h>
 #endif
 
 using namespace std;

src/gridtools/FourierTransform.cpp

@@ -24,7 +24,7 @@
 #include "ActionWithInputGrid.h"
 #include "core/ActionRegister.h"
 #ifdef __PLUMED_HAS_FFTW
-#include "fftw3.h" // FFTW interface
+#include <fftw3.h> // FFTW interface
 #endif
 
 namespace PLMD {