gmp/mpfr: use static libraries as make targets

The host shared objects are no more.

package/gmp/gmp.mk

@@ -10,7 +10,7 @@ GMP_CAT:=$(BZCAT)
 GMP_DIR:=$(TOOL_BUILD_DIR)/gmp-$(GMP_VERSION)
 GMP_TARGET_DIR:=$(BUILD_DIR)/gmp-$(GMP_VERSION)
 GMP_BINARY:=libgmp$(LIBTGTEXT)
-GMP_HOST_BINARY:=libgmp$(HOST_SHREXT)
+GMP_HOST_BINARY:=libgmp$(HOST_LIBEXT)
 GMP_LIBVERSION:=3.4.2
 
 # this is a workaround for a bug in GMP, please see

package/mpfr/mpfr.mk

@@ -12,7 +12,7 @@ MPFR_SITE:=http://www.mpfr.org/mpfr-$(MPFR_VERSION)
 MPFR_DIR:=$(TOOL_BUILD_DIR)/mpfr-$(MPFR_VERSION)
 MPFR_TARGET_DIR:=$(BUILD_DIR)/mpfr-$(MPFR_VERSION)
 MPFR_BINARY:=libmpfr$(LIBTGTEXT)
-MPFR_HOST_BINARY:=libmpfr$(HOST_SHREXT)
+MPFR_HOST_BINARY:=libmpfr$(HOST_LIBEXT)
 MPFR_LIBVERSION:=1.1.2
 
 # need patch