Build PCRE2 shim for jerbuild target

ober

dc59b4330d2a33099d6f55ff0afefe18b153455a

diff --git a/Makefile b/Makefile
index 6d50cbe..ad53707 100644
--- a/Makefile
+++ b/Makefile
@@ -777,6 +777,9 @@ jerboa_scintilla_shim.$(SHLIB_EXT): $(SCI_DIR)/jerboa_scintilla_shim.c $(SCI_VEN
 # pcre2 shim — copied from jerboa-pcre2 (already built there)
 PCRE2_DIR ?= $(JERBOA_PCRE2_ROOT)
 
+$(PCRE2_DIR)/jerboa_pcre2_shim.$(SHLIB_EXT): | vendor-deps
+	$(MAKE) -C $(PCRE2_DIR) JERBUILD="$(JERBUILD_TOOL)" shim
+
 jerboa_pcre2_shim.$(SHLIB_EXT): $(PCRE2_DIR)/jerboa_pcre2_shim.$(SHLIB_EXT)
 	cp $< $@