arm: emit .type %function directive in FUNC_START macro

The linker needs to know whether a symbol is STT_FUNCTION when
deciding which farcall stub to emit (if needed), this patch adds this
to the FUNC_START macro which is used in crt0.

libgloss/arm/crt0.S

@@ -48,6 +48,7 @@
 	.thumb
 .macro FUNC_START name
 	.global \name
+	.type \name, %function
 	.thumb_func
 \name:
 .endm
@@ -55,6 +56,7 @@
 	.code 32
 .macro FUNC_START name
 	.global \name
+	.type \name, %function
 \name:
 .endm
 #endif

libgloss/arm/redboot-crt0.S

@@ -17,6 +17,7 @@
 #ifdef PREFER_THUMB
 .macro FUNC_START name
 	.global \name
+	.type \name, %function
 	.thumb_func
 \name:
 .endm
@@ -24,6 +25,7 @@
 #else
 .macro FUNC_START name
 	.global \name
+	.type \name, %function
 \name:
 .endm
 	.code 32

newlib/libc/sys/arm/crt0.S

@@ -48,6 +48,7 @@
 	.thumb
 .macro FUNC_START name
 	.global \name
+	.type \name, %function
 	.thumb_func
 \name:
 .endm
@@ -55,6 +56,7 @@
 	.code 32
 .macro FUNC_START name
 	.global \name
+	.type \name, %function
 \name:
 .endm
 #endif