Fix library when using use_http=OFF (gh#622)

CMakeLists.txt

@@ -276,6 +276,8 @@ if(${use_http})
         ./src/httpheaders.c
         ${HTTP_C_FILE}
     )
+else()
+    add_definitions(-DHTTP_DISABLED)
 endif()
 
 if(${use_schannel})

adapters/platform_linux.c

@@ -31,11 +31,13 @@ int platform_init(void)
 {
     int result = 0;
 #ifndef DONT_USE_UPLOADTOBLOB
+#if !defined(HTTP_DISABLED)
     if (HTTPAPIEX_Init() == HTTPAPIEX_ERROR)
     {
         LogError("HTTP for upload to blob failed on initialization.");
         result = MU_FAILURE;
     }
+#endif /* HTTP_DISABLED */
 #endif /* DONT_USE_UPLOADTOBLOB */
 #ifdef USE_OPENSSL
     if (result == 0)
@@ -92,7 +94,9 @@ STRING_HANDLE platform_get_platform_info(PLATFORM_INFO_OPTION options)
 void platform_deinit(void)
 {
 #ifndef DONT_USE_UPLOADTOBLOB
+#if !defined(HTTP_DISABLED)
     HTTPAPIEX_Deinit();
+#endif /* HTTP_DISABLED */
 #endif /* DONT_USE_UPLOADTOBLOB */
 #ifdef USE_OPENSSL
     tlsio_openssl_deinit();

configs/azure_c_shared_utilityConfig.cmake

@@ -2,8 +2,10 @@
 #Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
 if(UNIX)
-    include(CMakeFindDependencyMacro)
-    find_dependency(CURL)
+    if(${use_http})
+        include(CMakeFindDependencyMacro)
+        find_dependency(CURL)
+    endif()
 endif()
 
 include("${CMAKE_CURRENT_LIST_DIR}/azure_c_shared_utilityTargets.cmake")