build: Do not export symbols from compiled ARM assembly

Author: hebasto

Makefile.am

@@ -98,6 +98,9 @@ libsecp256k1_la_SOURCES = src/secp256k1.c
 libsecp256k1_la_CPPFLAGS = $(SECP_CONFIG_DEFINES)
 libsecp256k1_la_LIBADD = $(COMMON_LIB) $(PRECOMPUTED_LIB)
 libsecp256k1_la_LDFLAGS = -no-undefined -version-info $(LIB_VERSION_CURRENT):$(LIB_VERSION_REVISION):$(LIB_VERSION_AGE)
+if USE_ASM_ARM
+libsecp256k1_la_LDFLAGS += -Wl,--exclude-libs,libsecp256k1_common.a
+endif
 
 noinst_PROGRAMS =
 if USE_BENCHMARK