Fix armhf (non-aarch64) build

Signed-off-by: falkTX <falktx@falktx.com>

source/modules/ysfx/Makefile

@@ -27,6 +27,11 @@ YSFX_FLAGS += -Wno-sign-compare
 YSFX_FLAGS += -Wno-unused-function
 YSFX_FLAGS += -Wno-unused-parameter
 
+ifeq ($(CPU_ARM),true)
+# In case -mthumb is enabled by default, we need -marm mode
+YSFX_FLAGS += -marm
+endif
+
 ifneq ($(WIN32),true)
 # NOTE: not compatible with MingGW, breaks win32_utf8
 YSFX_FLAGS += -D_FILE_OFFSET_BITS=64