Remove unneeded code for old Leptonica versions

Tesseract requires Leptonica 1.74 or newer,
so that code is no longer needed.
Signed-off-by: NStefan Weil <sw@weilnetz.de>

opencl/openclwrapper.cpp

@@ -27,21 +27,8 @@
 #include <stdio.h>
 #endif
 
-/*
-    Convenience macro to test the version of Leptonica.
-*/
-#if defined(LIBLEPT_MAJOR_VERSION) && defined(LIBLEPT_MINOR_VERSION)
-#define TESSERACT_LIBLEPT_PREREQ(maj, min) \
-  ((LIBLEPT_MAJOR_VERSION) > (maj) ||      \
-   ((LIBLEPT_MAJOR_VERSION) == (maj) && (LIBLEPT_MINOR_VERSION) >= (min)))
-#else
-#define TESSERACT_LIBLEPT_PREREQ(maj, min) 0
-#endif
-
-#if TESSERACT_LIBLEPT_PREREQ(1, 73)
 #define CALLOC LEPT_CALLOC
 #define FREE LEPT_FREE
-#endif
 
 #ifdef USE_OPENCL