fix which of pkgconf/pkg-config gets used

Author: chetmurthy

packages/conf-rocksdb-ge-8-0-0/conf-rocksdb-ge-8-0-0.8.0.0/opam

@@ -13,7 +13,13 @@ depends: [
    ("host-arch-x86_64" {os = "win32" & os-distribution != "cygwinports"} & "conf-mingw-w64-zstd-x86_64" {os = "win32" & os-distribution != "cygwinports"}))
 ]
 build: [
-  ["pkgconf" "--atleast-version=6.11.4" "rocksdb"]
+
+  ["pkgconf" {os = "win32" & os-distribution = "cygwin"}
+   "--personality=i686-w64-mingw32" {os = "win32" & os-distribution = "cygwin" & host-arch-x86_32:installed}
+   "--personality=x86_64-w64-mingw32" {os = "win32" & os-distribution = "cygwin" & host-arch-x86_64:installed}
+   "pkg-config" {os != "win32" | os-distribution != "cygwin"}
+   "--atleast-version=6.11.4" "rocksdb"]
+
 ]
 synopsis: "Virtual package relying on a system installation of RocksDB (version >= 8.0.0)"
 flags: conf