support alternate glibc name pow10 for exp10

include/math.h

@@ -391,6 +391,9 @@ long double ynl(int, long double);
 double      exp10(double);
 float       exp10f(float);
 long double exp10l(long double);
+double      pow10(double);
+float       pow10f(float);
+long double pow10l(long double);
 #endif
 
 #ifdef __cplusplus

src/math/exp10.c

 #define _GNU_SOURCE
 #include <math.h>
+#include "libc.h"
 
 double exp10(double x)
 {
@@ -17,3 +18,5 @@ double exp10(double x)
 	}
 	return pow(10.0, x);
 }
+
+weak_alias(exp10, pow10);

src/math/exp10f.c

 #define _GNU_SOURCE
 #include <math.h>
+#include "libc.h"
 
 float exp10f(float x)
 {
@@ -15,3 +16,5 @@ float exp10f(float x)
 	}
 	return exp2(3.32192809488736234787031942948939 * x);
 }
+
+weak_alias(exp10f, pow10f);

src/math/exp10l.c

 #define _GNU_SOURCE
 #include <math.h>
+#include "libc.h"
 
 long double exp10l(long double x)
 {
@@ -17,3 +18,5 @@ long double exp10l(long double x)
 	}
 	return powl(10.0, x);
 }
+
+weak_alias(exp10l, pow10l);