Update branches to arc-2026.03.

Currently the development branches are "arc-2026.03".

Signed-off-by: Luis Silva <luiss@synopsys.com>

Author: luismgsilva

Makefile.in

@@ -11,11 +11,11 @@ newlib_url := ftp://sourceware.org/pub/newlib/newlib-$(newlib_version).tar.gz
 
 # SNPS toolchains
 SNPS_GIT_URL    	:= https://github.com/foss-for-synopsys-dwc-arc-processors
-BINUTILS_BRANCH 	:= arc-2025.09
-GCC_BRANCH      	:= arc-2025.09
-NEWLIB_BRANCH   	:= arc-2025.09
+BINUTILS_BRANCH 	:= arc-2026.03
+GCC_BRANCH      	:= arc-2026.03
+NEWLIB_BRANCH   	:= arc-2026.03
 QEMU_BRANCH     	:= master
-GLIBC_BRANCH    	:= arc-2025.09
+GLIBC_BRANCH    	:= arc-2026.03
 BUILDROOT_BRANCH	:= arc64
 LINUX_BRANCH 		:= arc64