Fix for Cobalt build: Copy curlbuild.h into a "curl" subdir.

Change-Id: I6933c2508e98929a81e329cdca115dca731c5a67
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8528038..a938d1d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -37,6 +37,12 @@
 file(RENAME ${CMAKE_CURRENT_BINARY_DIR}/curlbuild.h.cobalt
             ${CMAKE_CURRENT_BINARY_DIR}/curlbuild.h)
 
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/include/curl/curlbuild.h.cobalt
+     DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/curl)
+
+file(RENAME ${CMAKE_CURRENT_BINARY_DIR}/curl/curlbuild.h.cobalt
+            ${CMAKE_CURRENT_BINARY_DIR}/curl/curlbuild.h)
+
 include_directories("include")
 include_directories("lib")
 include_directories(BEFORE SYSTEM  ${OPENSSL_INCLUDE_DIR})