Revert "Don't use __weak_reference() when a __strong_reference() is needed."

Unlike the __weak_reference() macro, __strong_reference() does type
checking. It can only create the reference if the type of the source and
the destination function match exactly.

Even if double == long double in practice, they remain unequal at the
language level.

Author: EdSchouten

src/e_acos.c

@@ -107,5 +107,5 @@ __ieee754_acos(double x)
 }
 
 #if LDBL_MANT_DIG == 53
-__strong_reference(acos, acosl);
+__weak_reference(acos, acosl);
 #endif

src/e_asin.c

@@ -113,5 +113,5 @@ __ieee754_asin(double x)
 }
 
 #if LDBL_MANT_DIG == 53
-__strong_reference(asin, asinl);
+__weak_reference(asin, asinl);
 #endif

src/e_atan2.c

@@ -125,5 +125,5 @@ __ieee754_atan2(double y, double x)
 }
 
 #if LDBL_MANT_DIG == 53
-__strong_reference(atan2, atan2l);
+__weak_reference(atan2, atan2l);
 #endif

src/e_hypot.c

@@ -127,5 +127,5 @@ __ieee754_hypot(double x, double y)
 }
 
 #if LDBL_MANT_DIG == 53
-__strong_reference(hypot, hypotl);
+__weak_reference(hypot, hypotl);
 #endif

src/e_remainder.c

@@ -75,5 +75,5 @@ __ieee754_remainder(double x, double p)
 }
 
 #if LDBL_MANT_DIG == 53
-__strong_reference(remainder, remainderl);
+__weak_reference(remainder, remainderl);
 #endif

src/e_sqrt.c

@@ -189,7 +189,7 @@ __ieee754_sqrt(double x)
 }
 
 #if (LDBL_MANT_DIG == 53)
-__strong_reference(sqrt, sqrtl);
+__weak_reference(sqrt, sqrtl);
 #endif
 
 /*

src/s_atan.c

@@ -120,5 +120,5 @@ atan(double x)
 }
 
 #if LDBL_MANT_DIG == 53
-__strong_reference(atan, atanl);
+__weak_reference(atan, atanl);
 #endif

src/s_cbrt.c

@@ -114,5 +114,5 @@ cbrt(double x)
 }
 
 #if (LDBL_MANT_DIG == 53)
-__strong_reference(cbrt, cbrtl);
+__weak_reference(cbrt, cbrtl);
 #endif

src/s_ceil.c

@@ -73,5 +73,5 @@ ceil(double x)
 }
 
 #if LDBL_MANT_DIG == 53
-__strong_reference(ceil, ceill);
+__weak_reference(ceil, ceill);
 #endif

src/s_cos.c

@@ -85,5 +85,5 @@ cos(double x)
 }
 
 #if (LDBL_MANT_DIG == 53)
-__strong_reference(cos, cosl);
+__weak_reference(cos, cosl);
 #endif