configure: remove pointless checks for yasm etc.

mplayer doesn't use yasm, as or ranlib. They were only needed to
build with internal libav, which is gone.

Also, get rid of nm. nm was used to find out how external symbols are
mangled. Replace this by a platform check in mangle.h. As far as I
know, sane systems don't mangle symbols. Windows prefixes them with
an underscore ("_symbol"). I don't know about OSX.

1 files changed, 6 insertions, 0 deletions

diff --git a/mangle.h b/mangle.h
index 64c6f75619..0e37c88d7b 100644
--- a/mangle.h
+++ b/mangle.h
@@ -31,6 +31,12 @@
 #define attribute_used
 #endif
 
+#if _WIN32
+#define EXTERN_PREFIX "_"
+#else
+#define EXTERN_PREFIX ""
+#endif
+
 #if ARCH_X86_64 && defined(PIC)
 #define MANGLE(a) EXTERN_PREFIX #a "(%%rip)"
 #else