sendmail: link with gcc instead of ld

If ld is used directly to link libmilter.so, linking is not done
correctly with glibc, and produces a library that can't be used.
Linking with the bad library produces a strange error:
ld: conftest: hidden symbol `stat' in [...]libc_nonshared.a(stat.oS)
is referenced by DSO

Using ld with musl works fine, but using gcc is a more portable way of
linking the shared library anyway.

Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>

mail/sendmail/files/OpenWrt

@@ -13,7 +13,7 @@ APPENDDEF(`confLIBSEARCH', `crypt')
 define(`confMTCCOPTS', `-D_REENTRANT')
 define(`confMTLDOPTS', `-lpthread')
 define(`confLDOPTS_SO', `-shared')
-define(`confSONAME',`-soname')
+define(`confSONAME',`-Wl,-soname')
 
 define(`currentuser', esyscmd(`id -nu'))
 define(`currentgroup', esyscmd(`id -ng'))

mail/sendmail/files/sharedlibrary.m4

@@ -9,7 +9,7 @@ include(confBUILDTOOLSDIR`/M4/'bldM4_TYPE_DIR`/defines.m4')
 divert(bldTARGETS_SECTION)
 
 bldCURRENT_PRODUCT.so.confSOVER: ${BEFORE} ${bldCURRENT_PRODUCT`OBJS'}
-	${LD} ${LDOPTS_SO} -o bldCURRENT_PRODUCT.so.confSOVER confSONAME bldCURRENT_PRODUCT.so.confSOVER ${bldCURRENT_PRODUCT`OBJS'}
+	${CC} ${LDOPTS_SO} -o bldCURRENT_PRODUCT.so.confSOVER confSONAME,bldCURRENT_PRODUCT.so.confSOVER ${bldCURRENT_PRODUCT`OBJS'}
 ifdef(`bldLINK_SOURCES', `bldMAKE_SOURCE_LINKS(bldLINK_SOURCES)')
 
 install-`'bldCURRENT_PRODUCT: bldCURRENT_PRODUCT.so.confSOVER