Set visibility of global symbols used in ARM specific assembly file to
internal.

Taken from Debian:
https://salsa.debian.org/multimedia-team/mpeg2dec/blob/master/debian/patches/60_arm-private-symbols.patch

--- mpeg2dec.orig/libmpeg2/motion_comp_arm_s.S
+++ mpeg2dec/libmpeg2/motion_comp_arm_s.S
@@ -23,7 +23,8 @@
 
 @ ----------------------------------------------------------------
 	.align
-	.global MC_put_o_16_arm
+	.global   MC_put_o_16_arm
+	.internal MC_put_o_16_arm
 MC_put_o_16_arm:
 	@@ void func(uint8_t * dest, const uint8_t * ref, int stride, int height)
 	pld [r1]
@@ -83,7 +84,8 @@ MC_put_o_16_arm_align_jt:
 
 @ ----------------------------------------------------------------
 	.align
-	.global MC_put_o_8_arm
+	.global   MC_put_o_8_arm
+	.internal MC_put_o_8_arm
 MC_put_o_8_arm:
 	@@ void func(uint8_t * dest, const uint8_t * ref, int stride, int height)
 	pld [r1]
@@ -152,7 +154,8 @@ MC_put_o_8_arm_align_jt:
 .endm
 
 	.align
-	.global MC_put_x_16_arm
+	.global   MC_put_x_16_arm
+	.internal MC_put_x_16_arm
 MC_put_x_16_arm:
 	@@ void func(uint8_t * dest, const uint8_t * ref, int stride, int height)
 	pld [r1]
@@ -244,7 +247,8 @@ MC_put_x_16_arm_align_jt:
 
 @ ----------------------------------------------------------------
 	.align
-	.global MC_put_x_8_arm
+	.global   MC_put_x_8_arm
+	.internal MC_put_x_8_arm
 MC_put_x_8_arm:
 	@@ void func(uint8_t * dest, const uint8_t * ref, int stride, int height)
 	pld [r1]
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<tr><td><span title='2021-01-27 16:43:51 +0100'>2021-01-27</span></td><td><a href='/guix/commit/gnu/packages/search.scm?id=d8aa4444688ce244d2556630c3f7cfe739e01310'>gnu: Add ugrep.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/search.scm (ugrep): New Variable.
</span></span></td><td>Hartmut Goebel</td></tr>
<tr><td><span title='2021-01-18 01:34:53 +0100'>2021-01-18</span></td><td><a href='/guix/commit/gnu/packages/search.scm?id=cbc2c28ad4337781c679b7588a74740b2ba7d189'>gnu: xapian, python-xapian-bindings: Update to 1.4.18.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/search.scm (xapian, python-xapian-bindings): Update to 1.4.18.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-01-03 06:55:40 +0100'>2021-01-03</span></td><td><a href='/guix/commit/gnu/packages/search.scm?id=78a9cfa33e66c5647cea66980d83f49a43e27f60'>gnu: perl-search-xapian: Update to 1.2.25.4.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/search.scm (perl-search-xapian): Update to 1.2.25.4.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>