Add support for a.out object format to assembler macros.

This format is still used by e.g. OS/2.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

libavcodec/x86/dsputil_yasm.asm

@@ -30,7 +30,7 @@ pb_zz11zz55zz99zzdd: db -1,-1,1,1,-1,-1,5,5,-1,-1,9,9,-1,-1,13,13
 pb_revwords: db 14, 15, 12, 13, 10, 11, 8, 9, 6, 7, 4, 5, 2, 3, 0, 1
 pd_16384: times 4 dd 16384
 
-section .text align=16
+SECTION_TEXT
 
 %macro SCALARPRODUCT 1
 ; int scalarproduct_int16(int16_t *v1, int16_t *v2, int order, int shift)

libavcodec/x86/fft_mmx.asm

@@ -85,7 +85,7 @@ cextern cos_ %+ i
     %1
 %endmacro
 
-section .text align=16
+SECTION_TEXT
 
 %macro T2_3DN 4 ; z0, z1, mem0, mem1
     mova     %1, %3

libavcodec/x86/fmtconvert.asm

@@ -22,7 +22,7 @@
 %include "x86inc.asm"
 %include "x86util.asm"
 
-section .text align=16
+SECTION_TEXT
 
 %macro PSWAPD_SSE 2
     pshufw %1, %2, 0x4e

libavcodec/x86/x86inc.asm

@@ -63,11 +63,22 @@
     %elifidn __OUTPUT_FORMAT__,macho
         SECTION .text align=%1
         fakegot:
+    %elifidn __OUTPUT_FORMAT__,aout
+        section .text
     %else
         SECTION .rodata align=%1
     %endif
 %endmacro
 
+; aout does not support align=
+%macro SECTION_TEXT 0-1 16
+    %ifidn __OUTPUT_FORMAT__,aout
+        SECTION .text
+    %else
+        SECTION .text align=%1
+    %endif
+%endmacro
+
 %ifdef WIN64
     %define PIC
 %elifndef ARCH_X86_64