patches/coreboot-4.11: fix bootblock.inc parallel build race condition

The ROMCC bootblock.inc recipe writes a dependency file via shell redirect
to $(objgenerated)/bootblock.inc.d. In a fresh parallel (-j) build, make
can schedule this before build-dirs creates the generated/ directory,
causing:
  sh: EOL_librem_l1um/generated/bootblock.inc.d: No such file or directory

This was hidden by CI cache (coreboot-4.11 crossgcc and build directory
were cached), but exposed when cache was invalidated by the coreboot
module rename in the previous commit.

Add build-dirs as a prerequisite for $(objgenerated)/bootblock.inc,
matching the existing fix for assembly.inc (0073-build-race-condition-fixes.patch).

Signed-off-by: Filip Lewiński <filip.lewinski@3mdeb.com>

Author: filipleple

patches/coreboot-4.11/0077-bootblock-inc-build-race-condition-fix.patch

@@ -0,0 +1,23 @@
+src/arch/x86: Ensure $(objgenerated) exists before bootblock.inc is built
+
+The $(objgenerated)/bootblock.inc recipe writes a dependency file to
+$(objgenerated)/bootblock.inc.d via shell redirect:
+
+  $(CC_bootblock) ... -MM -MT$(objgenerated)/bootblock.inc \
+      $< > $(objgenerated)/bootblock.inc.d
+
+In a parallel build (-j), make can try to generate bootblock.inc before
+the build-dirs target has created the $(objgenerated)/ directory, causing
+the shell redirect to fail with "No such file or directory".
+
+Enforce that build-dirs is done before bootblock.inc starts, matching the
+fix already applied to assembly.inc in 0073-build-race-condition-fixes.patch.
+
+diff --git a/src/arch/x86/Makefile.inc b/src/arch/x86/Makefile.inc
+--- a/src/arch/x86/Makefile.inc
++++ b/src/arch/x86/Makefile.inc
+@@ -167,3 +167,3 @@
+ -include $(objgenerated)/bootblock.inc.d
+-$(objgenerated)/bootblock.inc: $(src)/arch/x86/$(subst ",,$(CONFIG_BOOTBLOCK_SOURCE)) $(objutil)/romcc/romcc $(OPTION_TABLE_H) $(KCONFIG_AUTOHEADER)
++$(objgenerated)/bootblock.inc: build-dirs $(src)/arch/x86/$(subst ",,$(CONFIG_BOOTBLOCK_SOURCE)) $(objutil)/romcc/romcc $(OPTION_TABLE_H) $(KCONFIG_AUTOHEADER)
+ # The open quote in the subst messes with syntax highlighting. Fix it - ")