termux_setup_gir: Use `vapigen` wrapper

scripts/build/setup/termux_setup_gir.sh

@@ -17,6 +17,7 @@ termux_setup_gir() {
 		else
 			local scanner="$bin/g-ir-scanner"
 			local compiler="$bin/g-ir-compiler"
+			local vapigen="$bin/vapigen"
 			local ldd="$bin/ldd"
 			export TERMUX_G_IR_COMPILER="$compiler"
 
@@ -38,6 +39,14 @@ termux_setup_gir() {
 			EOF
 			chmod 0700 "$compiler"
 
+			cat > "$vapigen" <<-EOF
+				#!$(command -v sh)
+				exec /usr/bin/vapigen \
+					--girdir="$TERMUX_PREFIX/share/gir-1.0" \
+					"\$@"
+			EOF
+			chmod 0700 "$vapigen"
+
 			cat > "$ldd" <<-EOF
 				#!/bin/bash-static
 				unset LD_LIBRARY_PATH