Search for pcre also in HOMEBREW_PREFIX

Fixes installing nginx when Homebrew is not in /usr/local

Closes Homebrew/homebrew#76

Formula/nginx.rb

@@ -6,7 +6,11 @@ class Nginx < Formula
   @md5='ab22f1b7f098a90d803a3abb94d23f7e'
 
   depends_on 'pcre'
-  
+
+  def patches
+    DATA
+  end
+
   def options
     [
       ['--with-passenger', "Compile with support for Phusion Passenger module"]
@@ -36,3 +40,31 @@ class Nginx < Formula
     system "make install"
   end 
 end
+
+__END__
+--- a/auto/lib/pcre/conf
++++ b/auto/lib/pcre/conf
+@@ -155,6 +155,22 @@ else
+             . auto/feature
+         fi
+ 
++        if [ $ngx_found = no ]; then
++
++            # Homebrew
++           HOMEBREW_PREFIX=${NGX_PREFIX%Cellar*}
++            ngx_feature="PCRE library in ${HOMEBREW_PREFIX}"
++            ngx_feature_path="${HOMEBREW_PREFIX}/include"
++
++            if [ $NGX_RPATH = YES ]; then
++                ngx_feature_libs="-R#{HOMEBREW_PREFIX}/lib -L#{HOMEBREW_PREFIX}/lib -lpcre"
++            else
++                ngx_feature_libs="-L#{HOMEBREW_PREFIX}/lib -lpcre"
++            fi
++
++            . auto/feature
++        fi
++
+         if [ $ngx_found = yes ]; then
+             CORE_DEPS="$CORE_DEPS $REGEX_DEPS"
+             CORE_SRCS="$CORE_SRCS $REGEX_SRCS"
+