Remove -flat_namespace from MacOS build - see #7827.

Author: asfernandes

builds/posix/darwin.defaults

@@ -19,8 +19,8 @@
 
 # Options
 #FirebirdInstallPrefix=
-LIB_BUNDLE_OPTIONS=$(LD_FLAGS) -bundle -flat_namespace -undefined suppress
-LIB_LINK_OPTIONS=$(LD_FLAGS) -dynamiclib -flat_namespace
+LIB_BUNDLE_OPTIONS=$(LD_FLAGS) -bundle
+LIB_LINK_OPTIONS=$(LD_FLAGS) -dynamiclib
 LIB_LINK_SONAME:=-current_version @FIREBIRD_VERSION@ -compatibility_version @FIREBIRD_VERSION@ -seg1addr 0x30000000
 LIB_LINK_MAPFILE=-Wl,-exported_symbols_list,$(1)