[Qemu-trivial] [PATCH for-4.1] roms: Correct the EDK2_BASETOOLS_OPTFLAGS variable description

[Philippe Mathieu-Daudé]

In commit 1cab464136b4 we incorrectly described the
EDK2_BASETOOLS_OPTFLAGS can pass CPPFLAGS and CFLAGS
options to the EDK2 build tools, but it only expands
the CFLAGS (not to the CPPFLAGS).
Update the description to be more accurate.

Reported-by: Laszlo Ersek <address@hidden>
Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
---
 roms/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/roms/Makefile b/roms/Makefile
index 1ff78b63bb3..d7fd6025e7c 100644
--- a/roms/Makefile
+++ b/roms/Makefile
@@ -120,8 +120,8 @@ build-efi-roms: build-pxe-roms
                $(patsubst %,bin-i386-efi/%.efidrv,$(pxerom_targets)) \
                $(patsubst %,bin-x86_64-efi/%.efidrv,$(pxerom_targets))
 
-# Build scripts can pass compiler/linker flags to the EDK2 build tools
-# via the EDK2_BASETOOLS_OPTFLAGS (CPPFLAGS and CFLAGS) and
+# Build scripts can pass compiler/linker flags to the EDK2
+# build  tools via the EDK2_BASETOOLS_OPTFLAGS (CFLAGS) and
 # EDK2_BASETOOLS_LDFLAGS (LDFLAGS) environment variables.
 #
 # Example:
-- 
2.20.1