SWIFT-952 Remove dependency on conditional defines in package file

XCode seems to have difficulty transferring SwiftPM conditional
defines to generated XCode projects. This patch removes the need
to depend on these definitions by hardcoding the changes directly
in the source

Author: mbroadst

Package.swift

@@ -24,12 +24,6 @@ let package = Package(
         .target(
             name: "CLibMongoC",
             dependencies: [],
-            cSettings: [
-                .define("MONGO_SWIFT_OS_LINUX", .when(platforms: [.linux])),
-                .define("MONGO_SWIFT_OS_DARWIN", .when(platforms: [.macOS])),
-                .define("BSON_COMPILATION"),
-                .define("MONGOC_COMPILATION")
-            ],
             linkerSettings: [
                 .linkedLibrary("resolv"),
                 .linkedLibrary("ssl", .when(platforms: [.linux])),

Sources/CLibMongoC/include/CLibMongoC_bson-config.h

@@ -14,10 +14,6 @@
  * limitations under the License.
  */
 
-#if !defined(BSON_INSIDE) && !defined(BSON_COMPILATION)
-#error "Only <bson/bson.h> can be included directly."
-#endif
-
 #ifndef BSON_CONFIG_H
 #define BSON_CONFIG_H
 

Sources/CLibMongoC/include/CLibMongoC_bson-prelude.h

@@ -15,5 +15,5 @@
  */
 
 #if !defined(BSON_INSIDE) && !defined(BSON_COMPILATION)
-#error "Only <bson/bson.h> can be included directly."
+// #error "Only <bson/bson.h> can be included directly."
 #endif

Sources/CLibMongoC/include/CLibMongoC_bson-version.h

@@ -14,12 +14,6 @@
  * limitations under the License.
  */
 
-
-#if !defined (BSON_INSIDE) && !defined (BSON_COMPILATION)
-#error "Only <bson/bson.h> can be included directly."
-#endif
-
-
 #ifndef BSON_VERSION_H
 #define BSON_VERSION_H
 

Sources/CLibMongoC/include/CLibMongoC_common-prelude.h

@@ -16,5 +16,5 @@
 
 #if !defined(MONGOC_INSIDE) && !defined(MONGOC_COMPILATION) && \
    !defined(BSON_COMPILATION) && !defined(BSON_INSIDE)
-#error "Only <mongoc/mongoc.h> or <bson/bson.h> can be included directly."
+// #error "Only <mongoc/mongoc.h> or <bson/bson.h> can be included directly."
 #endif

Sources/CLibMongoC/include/CLibMongoC_mongoc-config.h

@@ -14,11 +14,6 @@
  * limitations under the License.
  */
 
-#if !defined(MONGOC_INSIDE) && !defined(MONGOC_COMPILATION)
-#error "Only <mongoc/mongoc.h> can be included directly."
-#endif
-
-
 #ifndef MONGOC_CONFIG_H
 #define MONGOC_CONFIG_H
 
@@ -32,7 +27,7 @@
 #define MONGOC_CC "/usr/bin/cc"
 
 /* Defines introduced by `Package.swift` */
-#ifdef MONGO_SWIFT_OS_DARWIN
+#ifdef __APPLE__
 #  define MONGOC_ENABLE_SSL_SECURE_TRANSPORT 1
 #  define MONGOC_ENABLE_CRYPTO_COMMON_CRYPTO 1
 #  define MONGOC_ENABLE_CRYPTO_LIBCRYPTO 0
@@ -44,11 +39,11 @@
 #  define MONGOC_ENABLE_SSL_SECURE_TRANSPORT 0
 #  define MONGOC_ENABLE_CRYPTO_LIBCRYPTO 1
 #  define MONGOC_ENABLE_SSL_OPENSSL 1
-#  define MONGOC_HAVE_ASN1_STRING_GET0_DATA 1
-#endif
-
-#if MONGOC_ENABLE_SSL_OPENSSL && OPENSSL_VERSION_NUMBER < 0x10100000L
-#  define MONGOC_HAVE_ASN1_STRING_GET0_DATA 0
+#  if OPENSSL_VERSION_NUMBER < 0x10100000L
+#    define MONGOC_HAVE_ASN1_STRING_GET0_DATA 0 
+#  else
+#    define MONGOC_HAVE_ASN1_STRING_GET0_DATA 1 
+#  endif
 #endif
 
 /*

Sources/CLibMongoC/include/CLibMongoC_mongoc-prelude.h

@@ -15,5 +15,5 @@
  */
 
 #if !defined(MONGOC_INSIDE) && !defined(MONGOC_COMPILATION)
-#error "Only <mongoc/mongoc.h> can be included directly."
+// #error "Only <mongoc/mongoc.h> can be included directly."
 #endif

Sources/CLibMongoC/include/CLibMongoC_mongoc-version.h

@@ -14,12 +14,6 @@
  * limitations under the License.
  */
 
-
-#if !defined (MONGOC_INSIDE) && !defined (MONGOC_COMPILATION)
-#error "Only <mongoc/mongoc.h> can be included directly."
-#endif
-
-
 #ifndef MONGOC_VERSION_H
 #define MONGOC_VERSION_H
 

etc/generated_headers/bson-config.h

@@ -14,10 +14,6 @@
  * limitations under the License.
  */
 
-#if !defined(BSON_INSIDE) && !defined(BSON_COMPILATION)
-#error "Only <bson/bson.h> can be included directly."
-#endif
-
 #ifndef BSON_CONFIG_H
 #define BSON_CONFIG_H
 

etc/generated_headers/bson-version.h

@@ -14,12 +14,6 @@
  * limitations under the License.
  */
 
-
-#if !defined (BSON_INSIDE) && !defined (BSON_COMPILATION)
-#error "Only <bson/bson.h> can be included directly."
-#endif
-
-
 #ifndef BSON_VERSION_H
 #define BSON_VERSION_H