gdb: tidy RISC-V part in gdb/Makefile.in and gdb/configure.tgt

I noticed that the length of line in gdb/configure.tgt was more than
80 lines, so I straightened it out. Also, in gdb/Makefile.in newly added
file riscv-linux-canonicalize-syscall-gen.c was missed in ALLDEPFILES,
so I added it there. And the last change: one more file
riscv-linux-canonicalize-syscall-gen.o was not in alphabetical order.
diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 3f64538..91b1648 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -770,8 +770,8 @@
 	mips-sde-tdep.o \
 	mips-tdep.o \
 	mips64-obsd-tdep.o \
-	riscv-linux-canonicalize-syscall-gen.o \
 	riscv-fbsd-tdep.o \
+	riscv-linux-canonicalize-syscall-gen.o \
 	riscv-linux-tdep.o \
 	riscv-none-tdep.o \
 	riscv-ravenscar-thread.o \
@@ -1929,6 +1929,7 @@
 	remote-sim.c \
 	riscv-fbsd-nat.c \
 	riscv-fbsd-tdep.c \
+	riscv-linux-canonicalize-syscall-gen.c \
 	riscv-linux-nat.c \
 	riscv-linux-tdep.c \
 	riscv-none-tdep.c \
diff --git a/gdb/configure.tgt b/gdb/configure.tgt
index fd9036f..8d821a1 100644
--- a/gdb/configure.tgt
+++ b/gdb/configure.tgt
@@ -546,9 +546,9 @@
 
 riscv*-*-linux*)
 	# Target: Linux/RISC-V
-	gdb_target_obs="riscv-linux-tdep.o riscv-linux-canonicalize-syscall-gen.o \
-			glibc-tdep.o linux-tdep.o solib-svr4.o solib-svr4-linux.o \
-			symfile-mem.o \
+	gdb_target_obs="riscv-linux-canonicalize-syscall-gen.o \
+			riscv-linux-tdep.o glibc-tdep.o linux-tdep.o \
+			solib-svr4.o solib-svr4-linux.o symfile-mem.o \
 			linux-record.o svr4-tls-tdep.o"
 	;;