sci-electronics/circt: fix test failure when Z3 unavailable

The circt-synth mig.mlir integration test was missing the libz3 and
circt-lec-jit REQUIRES guards that every sibling LEC test carries, so it
ran its circt-lec JIT commands and failed on unresolved Z3 symbols
instead of being skipped. Patch it to add the guards.

Closes: https://bugs.gentoo.org/977874
Signed-off-by: Huang Rui <vowstar@gmail.com>

sci-electronics/circt/circt-1.140.0.ebuild

@@ -63,6 +63,17 @@ DOCS=(
 	"${S_CIRCT}/circt-LICENSE"
 )
 
+src_prepare() {
+	# mig.mlir lacks the libz3/circt-lec-jit REQUIRES guards its sibling
+	# circt-synth LEC tests carry, so it runs and fails when Z3 is
+	# unavailable instead of being skipped.  See
+	# https://bugs.gentoo.org/977874
+	pushd "${S_CIRCT}" > /dev/null || die
+	eapply "${FILESDIR}"/${PN}-1.140.0-mig-require-libz3.patch
+	popd > /dev/null || die
+	cmake_src_prepare
+}
+
 src_configure() {
 	python_setup
 

sci-electronics/circt/files/circt-1.140.0-mig-require-libz3.patch

@@ -0,0 +1,15 @@
+Add the libz3/circt-lec-jit REQUIRES guards that every other circt-synth
+LEC test already carries.  Without them mig.mlir runs its circt-lec
+--shared-libs=%libz3 commands even when Z3 is unavailable, and the JIT
+aborts on unresolved Z3 symbols instead of the test being skipped.
+
+https://bugs.gentoo.org/977874
+
+--- a/integration_test/circt-synth/mig.mlir
++++ b/integration_test/circt-synth/mig.mlir
+@@ -1,3 +1,5 @@
++// REQUIRES: libz3
++// REQUIRES: circt-lec-jit
+ // RUN: circt-opt %s --pass-pipeline='builtin.module(hw.module(hw-aggregate-to-comb,convert-comb-to-synth{target-ir=mig},convert-synth-to-comb))' -o %t.mlir
+ // RUN: circt-lec %t.mlir %s -c1=bit_logical -c2=bit_logical --shared-libs=%libz3 | FileCheck %s --check-prefix=COMB_BIT_LOGICAL
+ // COMB_BIT_LOGICAL: c1 == c2