build: make use of 76 lib/*.h renamed files

76 private header files renamed to use our standard naming scheme.

This change affects 322 files in libcurl's source tree.

src/tool_setup.h

@@ -25,15 +25,15 @@
 #define CURL_NO_OLDIES
 
 /*
- * setup.h may define preprocessor macros such as _FILE_OFFSET_BITS and
+ * curl_setup.h may define preprocessor macros such as _FILE_OFFSET_BITS and
  * _LARGE_FILES in order to support files larger than 2 GB. On platforms
  * where this happens it is mandatory that these macros are defined before
  * any system header file is included, otherwise file handling function
  * prototypes will be misdeclared and curl tool may not build properly;
- * therefore we must include setup.h before curl.h when building curl.
+ * therefore we must include curl_setup.h before curl.h when building curl.
  */
 
-#include "setup.h" /* from the lib directory */
+#include "curl_setup.h" /* from the lib directory */
 
 /*
  * curl tool certainly uses libcurl's external interface.
@@ -67,7 +67,7 @@
 #endif
 
 #ifndef HAVE_STRDUP
-#  include "strdup.h"
+#  include "curl_strdup.h"
 #  define strdup(ptr) curlx_strdup(ptr)
 #endif