Make libcurve25519_donna get built as a .a

This lets us give it compiler flags differing from the rest of
libor-crypto.a

src/common/include.am

@@ -15,19 +15,25 @@ libor_extra_source=
 endif
 
 if BUILD_CURVE25519_DONNA
-libcrypto_extra_source= \
-	src/ext/curve25519_donna/curve25519-donna.c \
-	src/common/crypto_curve25519.c
+src_common_libcurve25519_donna_a_SOURCES=\
+	src/ext/curve25519_donna/curve25519-donna.c
+noinst_LIBRARIES+=src/common/libcurve25519_donna.a
+LIBDONNA=src/common/libcurve25519_donna.a
 else
 if BUILD_CURVE25519_DONNA_C64
-libcrypto_extra_source= \
-	src/ext/curve25519_donna/curve25519-donna-c64.c \
-	src/common/crypto_curve25519.c
+src_common_libcurve25519_donna_a_SOURCES=\
+	src/ext/curve25519_donna/curve25519-donna-c64.c
+noinst_LIBRARIES+=src/common/libcurve25519_donna.a
+LIBDONNA=src/common/libcurve25519_donna.a
 else
-if CURVE25519_ENABLED
-libcrypto_extra_source=src/common/crypto_curve25519.c
+LIBDONNA=
 endif
 endif
+
+src_common_libcurve25519_donna_a_CFLAGS =
+
+if CURVE25519_ENABLED
+libcrypto_extra_source=src/common/crypto_curve25519.c
 endif
 
 src_common_libor_a_SOURCES = \

src/or/include.am

@@ -95,7 +95,8 @@ AM_CPPFLAGS += -DSHARE_DATADIR="\"$(datadir)\"" \
 
 
 src_or_tor_LDFLAGS = @TOR_LDFLAGS_zlib@ @TOR_LDFLAGS_openssl@ @TOR_LDFLAGS_libevent@
-src_or_tor_LDADD = src/or/libtor.a src/common/libor.a src/common/libor-crypto.a \
+src_or_tor_LDADD = src/or/libtor.a src/common/libor.a \
+	src/common/libor-crypto.a $(LIBDONNA) \
 	src/common/libor-event.a \
 	@TOR_ZLIB_LIBS@ @TOR_LIB_MATH@ @TOR_LIBEVENT_LIBS@ @TOR_OPENSSL_LIBS@ \
 	@TOR_LIB_WS32@ @TOR_LIB_GDI@

src/test/include.am

@@ -36,14 +36,16 @@ src_test_bench_CPPFLAGS= $(src_test_AM_CPPFLAGS)
 
 src_test_test_LDFLAGS = @TOR_LDFLAGS_zlib@ @TOR_LDFLAGS_openssl@ \
         @TOR_LDFLAGS_libevent@
-src_test_test_LDADD = src/or/libtor.a src/common/libor.a src/common/libor-crypto.a \
+src_test_test_LDADD = src/or/libtor.a src/common/libor.a \
+	src/common/libor-crypto.a $(LIBDONNA) \
 	src/common/libor-event.a \
 	@TOR_ZLIB_LIBS@ @TOR_LIB_MATH@ @TOR_LIBEVENT_LIBS@ \
 	@TOR_OPENSSL_LIBS@ @TOR_LIB_WS32@ @TOR_LIB_GDI@
 
 src_test_bench_LDFLAGS = @TOR_LDFLAGS_zlib@ @TOR_LDFLAGS_openssl@ \
         @TOR_LDFLAGS_libevent@
-src_test_bench_LDADD = src/or/libtor.a src/common/libor.a src/common/libor-crypto.a \
+src_test_bench_LDADD = src/or/libtor.a src/common/libor.a \
+	src/common/libor-crypto.a $(LIBDONNA) \
 	src/common/libor-event.a \
 	@TOR_ZLIB_LIBS@ @TOR_LIB_MATH@ @TOR_LIBEVENT_LIBS@ \
 	@TOR_OPENSSL_LIBS@ @TOR_LIB_WS32@ @TOR_LIB_GDI@

src/tools/include.am

@@ -8,12 +8,14 @@ src_tools_tor_resolve_LDADD = src/common/libor.a @TOR_LIB_MATH@ @TOR_LIB_WS32@
 src_tools_tor_gencert_SOURCES = src/tools/tor-gencert.c
 src_tools_tor_gencert_LDFLAGS = @TOR_LDFLAGS_zlib@ @TOR_LDFLAGS_openssl@
 src_tools_tor_gencert_LDADD = src/common/libor.a src/common/libor-crypto.a \
+	$(LIBDONNA) \
         @TOR_LIB_MATH@ @TOR_ZLIB_LIBS@ @TOR_OPENSSL_LIBS@ \
         @TOR_LIB_WS32@ @TOR_LIB_GDI@
 
 src_tools_tor_checkkey_SOURCES = src/tools/tor-checkkey.c
 src_tools_tor_checkkey_LDFLAGS = @TOR_LDFLAGS_zlib@ @TOR_LDFLAGS_openssl@
 src_tools_tor_checkkey_LDADD = src/common/libor.a src/common/libor-crypto.a \
+	$(LIBDONNA) \
         @TOR_LIB_MATH@ @TOR_ZLIB_LIBS@ @TOR_OPENSSL_LIBS@ \
         @TOR_LIB_WS32@ @TOR_LIB_GDI@