add support for .s translation like .S

libc/sysdeps/linux/Makefile.arch

@@ -5,17 +5,13 @@
 # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 #
 
-ifeq ($(TARGET_ARCH),)
-$(error TARGET_ARCH is not set, no .config exists in topdir)
-endif
-
 ARCH_DIR  := $(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
 ARCH_OUT  := $(top_builddir)libc/sysdeps/linux/$(TARGET_ARCH)
 
 ARCH_CSRC := $(patsubst %.c,$(ARCH_DIR)/%.c,$(CSRC))
 ARCH_COBJ := $(patsubst %.c,$(ARCH_OUT)/%.o,$(CSRC))
-ARCH_SSRC := $(patsubst %.S,$(ARCH_DIR)/%.S,$(SSRC))
-ARCH_SOBJ := $(patsubst %.S,$(ARCH_OUT)/%.o,$(SSRC))
+ARCH_SSRC := $(patsubst %.s,$(ARCH_DIR)/%.s,$(patsubst %.S,$(ARCH_DIR)/%.S,$(SSRC)))
+ARCH_SOBJ := $(patsubst %.s,$(ARCH_OUT)/%.o,$(patsubst %.S,$(ARCH_OUT)/%.o,$(SSRC)))
 
 ARCH_OBJS := $(ARCH_COBJ) $(ARCH_SOBJ)