Update includes.

These changes to the includes actually were not necessary in order to
eliminate the generated include directory in the project root. However I
changed them anyway because they were a code smell (making assumptions
about the relative locations of files instead of using the include path
properly).

core/src/main/java/org/lflang/generator/c/CFileConfig.java

@@ -11,13 +11,7 @@ public class CFileConfig extends FileConfig {
   public CFileConfig(Resource resource, Path srcGenBasePath, boolean useHierarchicalBin)
       throws IOException {
     super(resource, srcGenBasePath, useHierarchicalBin);
-    var includeDir = getOutPath().resolve("include");
-    includePath =
-        !useHierarchicalBin
-            ? includeDir
-            : includeDir
-                .resolve(getOutPath().relativize(srcPath))
-                .resolve(srcFile.getFileName().toString().split("\\.")[0]);
+    includePath = getSrcGenPath().resolve("include");
   }
 
   public Path getIncludePath() {

core/src/main/java/org/lflang/generator/c/CGenerator.java

@@ -843,8 +843,6 @@ private void generateHeaders() throws IOException {
           },
           this::generateTopLevelPreambles);
     }
-    FileUtil.copyDirectoryContents(
-        fileConfig.getIncludePath(), fileConfig.getSrcGenPath().resolve("include"), false);
   }
 
   /**

test/C/c/bank_multiport_to_reaction_no_inlining.c

@@ -1,4 +1,4 @@
-#include "../include/BankMultiportToReactionNoInlining/BankMultiportToReactionNoInlining.h"
+#include "BankMultiportToReactionNoInlining/BankMultiportToReactionNoInlining.h"
 
 void check(bankmultiporttoreactionnoinlining_self_t* self, doublecount_out_t*** out) {
     for (int i = 0; i < 2; i++) {

test/C/c/bank_to_reaction_no_inlining.c

@@ -1,4 +1,4 @@
-#include "../include/BankToReactionNoInlining/BankToReactionNoInlining.h"
+#include "BankToReactionNoInlining/BankToReactionNoInlining.h"
 
 void check(banktoreactionnoinlining_self_t* self, count_out_t** out) {
     for (int i = 0; i < 2; i++) {

test/C/c/count.c

@@ -1,5 +1,5 @@
 #include <stdio.h>
-#include "../include/Count/Count.h"
+#include "Count/Count.h"
 
 void increment(count_self_t* self) {
     printf("in increment, count=%d\n", self->count);

test/C/c/count_hierarchy.c

@@ -1,5 +1,5 @@
 #include <stdio.h>
-#include "../include/CountHierarchy/CountHierarchy.h"
+#include "CountHierarchy/CountHierarchy.h"
 
 void increment(counthierarchy_self_t* self, timer_out_t* out) {
     printf("in increment, count=%d\n", self->count);

test/C/c/multiport_to_reaction_no_inlining.c

@@ -1,4 +1,4 @@
-#include "../include/MultiportToReactionNoInlining/MultiportToReactionNoInlining.h"
+#include "MultiportToReactionNoInlining/MultiportToReactionNoInlining.h"
 
 void check(multiporttoreactionnoinlining_self_t* self, source_out_t** out) {
     int sum = 0;

test/C/c/sendreceive.c

@@ -1,8 +1,8 @@
 #include <stdio.h>
 
-#include "../include/IntPrint/Print.h"
-#include "../include/IntPrint/Check.h"
-#include "../include/api/reaction_macros.h"
+#include "IntPrint/Print.h"
+#include "IntPrint/Check.h"
+#include "api/reaction_macros.h"
 
 void sender(print_self_t* self, print_out_t* out) {
     lf_set(out, 42);