chore: add feature openssl-static for linking OpenSSL statically.

yara-x/Cargo.toml

@@ -10,6 +10,19 @@ homepage.workspace = true
 rust-version.workspace = true
 
 [features]
+# When this feature is enabled the OpenSSL library is linked statically. 
+# However, you need to specify the path where the library and its header files
+# are located by setting the environment variable OPENSSL_DIR. For example:
+#
+# OPENSSL_DIR=/usr/local/Cellar/openssl@3/3.2.0_1/ cargo build --feature openssl-static
+#
+# The directory specified in OPENSSL_DIR must contain subdirectories /include 
+# and /lib. The latter must contain `libcrypto.a`.
+#
+# You can also set OPENSSL_INCLUDE_DIR and OPENSSL_LIB_DIR, for setting the
+# two directories independently.
+openssl-static = ['authenticode-parser/openssl-static']
+
 # Enables constant folding. When constant folding is enabled, expressions
 # like `2+2+2` and `true or false`, whose value can be determined at compile
 # time, will be reduced to its final value, instead of producing code that