Fix GNU stack management

This patch indicates to GCC that an executable stack is not necessary, since
these files are only responsible for storing assets as far as I know. If Surge
doesn't build with the correct stack settings, it might not run on machines
with hardware stack protection. See the link below for more information.

https://wiki.gentoo.org/wiki/Hardened/GNU_stack_quickstart

Patch by Ryan Fox

--- a/scripts/linux/emit-vector-piggy.py
+++ b/scripts/linux/emit-vector-piggy.py
@@ -73,6 +73,10 @@ header_file.write(u"""    {NULL, 0}
 };
 """)
 
+source_file.write("""#if defined(__linux__) && defined(__ELF__)
+.section .note.GNU-stack,"",%progbits
+#endif""")
+
 
 def save_if_modified(path, contents):
     try:
--- a/src/linux/ConfigurationXml.S
+++ b/src/linux/ConfigurationXml.S
@@ -8,3 +8,7 @@ configurationXmlEnd:
     .type configurationXmlNullTerminator, @object
 configurationXmlNullTerminator:
     .int 0
+
+#if defined(__linux__) && defined(__ELF__)
+.section .note.GNU-stack,"",%progbits
+#endif