File gnustep-base-fix_GCC15.patch of Package gnustep-base

--- a/Tools/Makefile.orig.preamble	2024-05-27 08:57:03.000000000 +0200
+++ b/Tools/Makefile.preamble	2025-01-24 21:56:17.830762556 +0100
@@ -46,7 +46,7 @@
 #ADDITIONAL_OBJCFLAGS +=
 
 # Additional flags to pass to the C compiler
-#ADDITIONAL_CFLAGS += 
+ADDITIONAL_CFLAGS += -std=gnu17
 
 # Additional include directories the compiler should search
 ADDITIONAL_INCLUDE_DIRS += -I../Source/$(GNUSTEP_TARGET_DIR) -I../Source/