parsec-openssl-provider: Fix MSRV build

Solve compilation issues when trying to compile with MSRV:

1) Use a version of env_logger that is compatible with MSRV.

2) The Error types declared by openssl_errors! were being marked as
private, which lead to the following error:

  --> parsec-openssl-provider-shared/src/catch.rs:37:1
   |
37 | /  pub fn r#catch<T>(
38 | |      function: Option<fn() -> openssl_errors::Function<super::Error>>,
39 | |      f: impl FnOnce() -> Result<T, Box<dyn std::error::Error>>,
40 | |  ) -> Result<T, ()> {

   | |___________________^ can't leak private type

Signed-off-by: Tomás González <tomasagustin.gonzalezorlando@arm.com>

Author: tgonzalezorlandoarm

parsec-openssl-provider-shared/src/lib.rs

@@ -32,7 +32,7 @@ unsafe extern "C" fn OSSL_provider_init(
 
 openssl_errors::openssl_errors! {
     #[allow(clippy::empty_enum)]
-    library Error("parsec_openssl_provider_shared") {
+    pub library Error("parsec_openssl_provider_shared") {
         functions {
             PROVIDER_INIT("parsec_provider_init");
         }

parsec-openssl-provider/Cargo.toml

@@ -15,4 +15,4 @@ log = "0.4"
 parsec-client = { git = "https://github.com/parallaxsecond/parsec-client-rust", tag="0.16.0" }
 parsec-openssl2 = { path = "../parsec-openssl2" }
 openssl-errors = "0.2.0"
-env_logger = "0.11.2"
+env_logger = "0.10.2"

parsec-openssl-provider/src/lib.rs

@@ -93,7 +93,7 @@ pub unsafe fn parsec_provider_provider_init(
 
 openssl_errors::openssl_errors! {
     #[allow(clippy::empty_enum)]
-    library Error("parsec_openssl_provider") {
+    pub library Error("parsec_openssl_provider") {
         functions {
             PROVIDER_TEARDOWN("parsec_provider_teardown");
             PROVIDER_GETTABLE_PARAMS("parsec_provider_gettable_params");