Scope libc fault-injection regression target to Linux

tests/Makefile.am

@@ -896,17 +896,19 @@ test_media_download_timeout_LDADD = $(LIBUTUN) $(CRYPTO_LIBS) $(COMMON_LIBS)
 test_media_download_timeout_LDFLAGS = -Wl,--wrap=etcp_route_send
 
 check_PROGRAMS += test_media_query
-test_media_query_SOURCES = test_media_query.c
+test_media_query_SOURCES = test_media_query.c media_delivery_fixture.h
 test_media_query_CFLAGS = $(test_media_delivery_download_CFLAGS)
 test_media_query_LDADD = $(LIBUTUN) $(CRYPTO_LIBS) $(COMMON_LIBS)
 test_media_query_LDFLAGS = -Wl,--wrap=etcp_route_send -Wl,--wrap=RAND_bytes
 
+if OS_LINUX
 check_PROGRAMS += test_media_blocks
 test_media_blocks_SOURCES = test_media_blocks.c media_delivery_fixture.h
 test_media_blocks_CFLAGS = $(test_media_delivery_download_CFLAGS)
 test_media_blocks_LDADD = $(LIBUTUN) $(CRYPTO_LIBS) $(COMMON_LIBS)
 test_media_blocks_LDFLAGS = -Wl,--wrap=etcp_route_send -Wl,--wrap=RAND_bytes -Wl,--wrap=fwrite -Wl,--wrap=fread -Wl,--wrap=__fread_chk \
     -Wl,--wrap=fseeko -Wl,--wrap=fclose -Wl,--wrap=fflush -Wl,--wrap=rename -Wl,--wrap=ma_sha256_file
+endif
 
 test_media_delivery_integration_SOURCES = test_media_delivery_integration.c
 test_media_delivery_integration_CFLAGS = -I$(top_srcdir)/src -I$(top_srcdir)/src/media_delivery -I$(top_srcdir)/src/media_async -I$(top_srcdir)/lib -I$(top_srcdir)/src/transport_layer -I$(top_srcdir)/src/routing_layer -I$(top_srcdir)/src/chat

tests/test_media_blocks.c

@@ -23,11 +23,13 @@ size_t __wrap_fread(void* bytes, size_t size, size_t count, FILE* file) {
     if (fail_io(IO_READ)) return 0;
     return __real_fread(bytes, size, count, file);
 }
+#ifdef __GLIBC__
 size_t __real___fread_chk(void*, size_t, size_t, size_t, FILE*);
 size_t __wrap___fread_chk(void* bytes, size_t capacity, size_t size, size_t count, FILE* file) {
     if (fail_io(IO_READ)) return 0;
     return __real___fread_chk(bytes, capacity, size, count, file);
 }
+#endif
 int __real_fseeko(FILE*, off_t, int);
 int __wrap_fseeko(FILE* file, off_t offset, int origin) {
     return fail_io(IO_SEEK) ? -1 : __real_fseeko(file, offset, origin);