libubacktrace: fix build due to some typos

Commit 71c10c484e7dc113396cccb7e503befb759c6346 broke libubactrace build
due to some typos, so that backtrace.o[sS] were not built.
This definetively fixes this problem.

Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>

libubacktrace/Makefile.in

@@ -45,10 +45,10 @@ endif
 libubacktrace_SRCS := $(patsubst %.c,$(libubacktrace_DIR)/%.c,$(libubacktrace_SRC-y))
 libubacktrace_OBJS := $(patsubst $(libubacktrace_DIR)/%.c,$(libubacktrace_OUT)/%.o,$(libubacktrace_SRCS))
 
-libubacktrace_SHARED_SRCS := $(patsubst %.c,$(libubacktrace_DIR)/%.c,$(libubacktrace_SHARED_SRC-y))
-libubacktrace_SHARED_OBJS := $(patsubst $(libubacktrace_DIR)/%.c,$(libubacktrace_OUT)/%.s,$(libubacktrace_SHARED_SRCS))
+libubacktrace_SHARED_SRCS := $(patsubst %.c,$(libubacktrace_DIR)/%.c,$(libubacktrace_SRC_SHARED-y))
+libubacktrace_SHARED_OBJS := $(patsubst $(libubacktrace_DIR)/%.c,$(libubacktrace_OUT)/%.o,$(libubacktrace_SHARED_SRCS))
 
-libubacktrace-shared-y	:= $(libubacktrace_SHARED_OBJS:.os=.oS)
+libubacktrace-shared-y	:= $(libubacktrace_SHARED_OBJS:.o=.oS)
 libubacktrace-static-y	:= $(libubacktrace_SHARED_OBJS)
 
 ifeq ($(DOPIC),y)