IVGCVSW-5295 Change fmt to be a header-only interface library

 * Fix non-virtual-dtor warnings in fmt
 * Fix wrong fmt include in TfParser
 * Make fmt work in nn-driver
 * Make fmt a header-only interface library
 * Link fmt where necessary

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: I9db7cd9a133a81262cbf79f04fb419ab97b88ea8
diff --git a/Android.mk b/Android.mk
index 2d3aa96..f767b20 100644
--- a/Android.mk
+++ b/Android.mk
@@ -249,7 +249,8 @@
         -std=$(CPP_VERSION) \
         -fexceptions \
         -Wno-unused-parameter \
-        -frtti
+        -frtti \
+        -DFMT_HEADER_ONLY
 
 # The variable to enable/disable the CL backend (ARMNN_COMPUTE_CL_ENABLED) is declared in android-nn-driver/Android.mk
 ifeq ($(ARMNN_COMPUTE_CL_ENABLED),1)