make: unbreak scan-build again for gnu-efi
make: unbreak scan-build again for gnu-efi

When using clang-analyzer, scan-build sets CC to
/usr/bin/../libexec/ccc-analyzer, which for whatever reason when we're
in the sub-make to build gnu-efi, then gets confused and invokes gcc
rather than clang.  This causes gnu-efi's attempt to check which
compiler it's using to fail, because "/usr/bin/../libexec/ccc-analyzer
-v" invokes GCC.  At that point ccc-analyzer complains that it can't
find the clang invocation in its own output, which it chose not to use
clang for, as such:

/usr/bin/../libexec/ccc-analyzer -I/home/pjones/devel/github.com/shim/worktree/gnu-efi//lib -I/home/pjones/devel/github.com/shim/worktree/gnu-efi/inc -I/home/pjones/devel/github.com/shim/worktree/gnu-efi/inc/x86_64 -I/home/pjones/devel/github.com/shim/worktree/gnu-efi/inc/protocol -Wno-error=pragmas -mno-red-zone -mno-avx -fpic  -Os -Wall -Wextra -Wno-missing-field-initializers -Werror -fshort-wchar -fno-strict-aliasing -ffreestanding -fno-stack-protector -fno-stack-check -nostdinc   -isystem /home/pjones/devel/github.com/shim/worktree/gnu-efi/../include/system -isystem /usr/lib/gcc/x86_64-redhat-linux/11/include  -DCONFIG_x86_64 -DGNU_EFI_USE_MS_ABI -DGNU_EFI_USE_EXTERNAL_STDARG -maccumulate-outgoing-args --std=c11 -c /home/pjones/devel/github.com/shim/worktree/gnu-efi//lib/smbios.c -o smbios.o
could not find clang line
make[3]: *** [/home/pjones/devel/github.com/shim/worktree/gnu-efi//lib/../Make.rules:52: smbios.o] Error 1

This patch passes CCC_CC=$(COMPILER) to the gnu-efi sub-make, which
forces ccc-analyzer to use $(COMPILER), which is still clang.

Signed-off-by: Peter Jones <2e0a021e603479ff81838c00c3b770daca4e0214@redhat.com>

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