Fixes bug 22811465 - math:exp() throws badarith exception on SPARC
Fix was recommended by upstream Erlang/OTP team and is being applied to trunk.

--- otp_src_17.5-ORIG/erts/emulator/sys/ose/sys_float.c	2016-04-19 13:16:27.190731082 +0100
+++ otp_src_17.5/erts/emulator/sys/ose/sys_float.c	2016-04-19 13:18:30.669678699 +0100
@@ -835,10 +835,5 @@
 int
 matherr(struct exception *exc)
 {
-#if !defined(NO_FPE_SIGNALS)
-    volatile unsigned long *fpexnp = erts_get_current_fp_exception();
-    if (fpexnp != NULL)
-	*fpexnp = (unsigned long)__builtin_return_address(0);
-#endif
     return 1;
 }
--- otp_src_17.5-ORIG/erts/emulator/sys/unix/sys_float.c	2016-04-19 13:16:27.187000925 +0100
+++ otp_src_17.5/erts/emulator/sys/unix/sys_float.c	2016-04-19 13:18:22.503799817 +0100
@@ -837,11 +837,6 @@
 int
 matherr(struct exception *exc)
 {
-#if !defined(NO_FPE_SIGNALS)
-    volatile unsigned long *fpexnp = erts_get_current_fp_exception();
-    if (fpexnp != NULL)
-	*fpexnp = (unsigned long)__builtin_return_address(0);
-#endif
     return 1;
 }
 
--- otp_src_17.5-ORIG/erts/emulator/sys/win32/sys_float.c	2016-04-19 13:16:27.187779815 +0100
+++ otp_src_17.5/erts/emulator/sys/win32/sys_float.c	2016-04-19 13:19:05.229444947 +0100
@@ -138,8 +138,7 @@
 int
 matherr(struct _exception *exc)
 {
-    erl_fp_exception = 1;
-    DEBUGF(("FP exception (matherr) (0x%x) (%d)\n", exc->type, erl_fp_exception));
+    DEBUGF(("FP exception (matherr) (0x%x)\n", exc->type));
     return 1;
 }