crt files and statically linked libgcc objects cause false positives
in annobin coverage, so we add the assembler flag to generate notes
for them.

The patch also adds notes to libgcc_s.so, but this is harmless because
these notes only confer that there is no other annobin markup.

2018-07-25  Florian Weimer  <fweimer@redhat.com>

	* config/t-linux (LIBGCC2_CFLAGS, CRTSTUFF_CFLAGS): Add
	-Wa,--generate-missing-build-notes=yes.

--- libgcc/config/t-linux	2022-12-15 19:25:20.581394950 +0100
+++ libgcc/config/t-linux	2023-03-21 22:00:37.054478562 +0100
@@ -1,3 +1,6 @@
 # Override t-slibgcc-elf-ver to export some libgcc symbols with
 # the symbol versions that glibc used.
 SHLIB_MAPFILES += $(srcdir)/config/libgcc-glibc.ver
+
+LIBGCC2_CFLAGS += -Wa,--generate-missing-build-notes=yes
+CRTSTUFF_CFLAGS += -Wa,--generate-missing-build-notes=yes