configure: Follow the variable naming convention for libpcap.

configure

@@ -677,7 +677,7 @@ XSLT_LIBS
 XSLT_CFLAGS
 XML2_LIBS
 XML2_CFLAGS
-LIBPCAP
+PCAP_LIBS
 X_EXTRA_LIBS
 X_LIBS
 X_PRE_LIBS
@@ -10941,7 +10941,7 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_pcap_pcap_create" >&5
 $as_echo "$ac_cv_lib_pcap_pcap_create" >&6; }
 if test "x$ac_cv_lib_pcap_pcap_create" = xyes; then :
-  LIBPCAP="-lpcap"
+  PCAP_LIBS="-lpcap"
 
 fi
 
@@ -17127,6 +17127,7 @@ X_CFLAGS = $X_CFLAGS
 X_PRE_LIBS = $X_PRE_LIBS
 X_LIBS = $X_LIBS
 X_EXTRA_LIBS = $X_EXTRA_LIBS
+PCAP_LIBS = $PCAP_LIBS
 XML2_CFLAGS = $XML2_CFLAGS
 XML2_LIBS = $XML2_LIBS
 XSLT_CFLAGS = $XSLT_CFLAGS

configure.ac

@@ -1289,7 +1289,7 @@ test "x$ac_cv_lib_OpenCL_clGetPlatformInfo" != xyes && enable_opencl=${enable_op
 dnl **** Check for libpcap ****
 if test "$ac_cv_header_pcap_pcap_h" = "yes"
 then
-    AC_CHECK_LIB(pcap,pcap_create,[AC_SUBST(LIBPCAP,["-lpcap"])])
+    AC_CHECK_LIB(pcap,pcap_create,[AC_SUBST(PCAP_LIBS,["-lpcap"])])
 fi
 WINE_NOTICE_WITH(pcap,[test "x$ac_cv_lib_pcap_pcap_create" != xyes],
                  [pcap ${notice_platform}development files not found, wpcap won't be supported.])

dlls/wpcap/Makefile.in

 MODULE    = wpcap.dll
 DELAYIMPORTS = ws2_32
-EXTRALIBS = @LIBPCAP@
+EXTRALIBS = $(PCAP_LIBS)
 
 C_SRCS = \
 	wpcap.c