Fix conflicting types error.
https://github.com/DentonW/DevIL/pull/87
--- include/IL/devil_internal_exports.h.orig	2017-01-01 18:03:56.000000000 -0600
+++ include/IL/devil_internal_exports.h	2024-05-05 20:42:48.000000000 -0500
@@ -95,7 +95,7 @@
 ILAPI void  ILAPIENTRY ifree(const void *Ptr);
 ILAPI void* ILAPIENTRY icalloc(const ILsizei Size, const ILsizei Num);
 #ifdef ALTIVEC_GCC
-ILAPI void* ILAPIENTRY ivec_align_buffer(void *buffer, const ILuint size);
+ILAPI void* ILAPIENTRY ivec_align_buffer(void *buffer, const ILsizei size);
 #endif
 
 // Internal library functions in IL