[graphics][compute] Properly export C functions for use in C++ (HotSort)

Tracked by SPN-19.

Testability: HotSort library and test compile and run.
Change-Id: I6a80c97057493c3f967cc4eef30691e82d18ad16

src/graphics/lib/compute/hotsort/hotsort_gen/target_glsl.c

@@ -138,10 +138,26 @@ hsg_target_header_and_module(struct hsg_config const * const config)
             "//                                                        \n"
             "//                                                        \n"
             "                                                          \n"
+            "#ifdef __cplusplus                                        \n"
+            "extern \"C\" {                                            \n"
+            "#endif                                                    \n"
+            "                                                          \n"
+            "//                                                        \n"
+            "//                                                        \n"
+            "//                                                        \n"
+            "                                                          \n"
             "extern struct hotsort_vk_target const HS_TARGET_NAME;     \n"
             "                                                          \n"
             "//                                                        \n"
             "//                                                        \n"
+            "//                                                        \n"
+            "                                                          \n"
+            "#ifdef __cplusplus                                        \n"
+            "}                                                         \n"
+            "#endif                                                    \n"
+            "                                                          \n"
+            "//                                                        \n"
+            "//                                                        \n"
             "//                                                        \n",
             config->define.lower);
 

src/graphics/lib/compute/hotsort/platforms/vk/hotsort_vk.h

@@ -22,6 +22,14 @@
 //
 //
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//
+//
+//
+
 #include "hotsort_vk_target.h"
 
 //
@@ -151,3 +159,11 @@ hotsort_vk_sort(VkCommandBuffer                            cb,
 //
 //
 //
+
+#ifdef __cplusplus
+}
+#endif
+
+//
+//
+//

src/graphics/lib/compute/hotsort/platforms/vk/hotsort_vk_target.h

@@ -10,6 +10,14 @@
 
 #include <stdint.h>
 
+//
+//
+//
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 //
 // This structure packages target-specific HotSort parameters and
 // SPIR-V modules.
@@ -65,3 +73,11 @@ struct hotsort_vk_target
 //
 //
 //
+
+#ifdef __cplusplus
+}
+#endif
+
+//
+//
+//