thunderbird: disable LTO for Loongson3

Author: CSharperMantle

app-web/thunderbird/autobuild/defines

@@ -15,6 +15,9 @@ USECLANG=1
 
 # FIXME: ld.lld: error: ../../../dist/bin/libxul.so.lto.o:(function nsXPTCStubBase::Stub22(): .text+0x74): relocation R_RISCV_JAL out of range: -28960346 is not in [-1048576, 1048575]; references 'SharedStub'
 NOLTO__RISCV64=1
+# FIXME: /tmp/lto-llvm-ba2033.o: in function `memset':
+#        /usr/include/bits/string_fortified.h:59:(.text.jpeg_CreateCompress+0x34): relocation truncated to fit: R_MIPS_CALL16 against `memset@@GLIBC_2.0'
+NOLTO__LOONGSON3=1
 
 # FIXME: STL code can only be used with -fno-exceptions
 AB_FLAGS_EXC=0