configure: Only decompress EDK2 blobs for X86/ARM targets

The EDK2 firmware blobs only target the X86/ARM architectures.
Define the DECOMPRESS_EDK2_BLOBS variable and only decompress
the blobs when the variable exists.

See also: 536d2173b2 ("roms: build edk2 firmware binaries ...")
Suggested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20191108114531.21518-2-philmd@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Reviewed-by: Luc Michel <luc.michel@greensocs.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

Makefile

@@ -480,7 +480,9 @@ $(SOFTMMU_ALL_RULES): $(chardev-obj-y)
 $(SOFTMMU_ALL_RULES): $(crypto-obj-y)
 $(SOFTMMU_ALL_RULES): $(io-obj-y)
 $(SOFTMMU_ALL_RULES): config-all-devices.mak
+ifdef DECOMPRESS_EDK2_BLOBS
 $(SOFTMMU_ALL_RULES): $(edk2-decompressed)
+endif
 
 .PHONY: $(TARGET_DIRS_RULES)
 # The $(TARGET_DIRS_RULES) are of the form SUBDIR/GOAL, so that

configure

@@ -427,6 +427,7 @@ softmmu="yes"
 linux_user="no"
 bsd_user="no"
 blobs="yes"
+edk2_blobs="no"
 pkgversion=""
 pie=""
 qom_cast_debug="yes"
@@ -2146,6 +2147,14 @@ case " $target_list " in
   ;;
 esac
 
+for target in $target_list; do
+  case "$target" in
+    arm-softmmu | aarch64-softmmu | i386-softmmu | x86_64-softmmu)
+      edk2_blobs="yes"
+      ;;
+  esac
+done
+
 feature_not_found() {
   feature=$1
   remedy=$2
@@ -7526,6 +7535,10 @@ if test "$libudev" != "no"; then
     echo "LIBUDEV_LIBS=$libudev_libs" >> $config_host_mak
 fi
 
+if test "$edk2_blobs" = "yes" ; then
+  echo "DECOMPRESS_EDK2_BLOBS=y" >> $config_host_mak
+fi
+
 # use included Linux headers
 if test "$linux" = "yes" ; then
   mkdir -p linux-headers